The mean and median on a density curve may be very close or even the same, especially for symmetric distributions.
For skewed distributions, the mean and median may be quite different.
On a density curve, the mean and median can be marked as follows:
Mean:
The mean of a density curve represents the average value of the data.
It is also known as the expected value.
The mean is the point at which the density curve would balance if it were made of a solid material.
To mark the mean on a density curve, locate the point where the curve is cut in half by its own weight.
This point is the mean of the distribution.
It can be represented by a vertical line drawn through this point on the x-axis.
Median:
The median of a density curve is the point that divides the area under the curve in half.
It is the point that separates the lower 50% of the data from the upper 50%.
To mark the median on a density curve, locate the point where the curve intersects the horizontal line at the midpoint of the area under the curve.
This point is the median of the distribution.
It can be represented by a vertical line drawn through this point on the x-axis.
In general, the mean is more sensitive to outliers than the median, which makes the median a better measure of central tendency for distributions with extreme values.
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if you standardize every test score from Mr. Bowman's class what would the new mean and standard deviation be and how would the shape be effected?
Standardize every test score from Mr. Bowman's class, the new mean would be 0, the new standard deviation would be 1, and the shape of the distribution would remain the same as before.
Let's first understand what standardizing means.
Standardizing test scores involves transforming the original scores to a new scale, called z-scores.
This process is done by subtracting the mean (average) score from each test score and dividing the result by the standard deviation of the scores. The formula for finding the z-score is:
z = (X - μ) / σ
X is the original test score, μ is the mean, and σ is the standard deviation.
Now, let's discuss the properties of the standardized scores:
New mean:
Standardize the test scores, the new mean (average) of the z-scores will always be 0.
This occurs because we subtract the mean from each test score, making the sum of the differences equal to 0.
New standard deviation:
After standardization, the standard deviation of the z-scores will always be 1.
This is because we divide each score by the original standard deviation, results in the new standard deviation being equal to 1.
Shape of the distribution:
The shape of the distribution (i.e., the pattern of the scores) will not be affected by standardization.
If the original scores followed a bell-shaped curve, the standardized scores would maintain the same bell shape.
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The price of products may increase due to inflation and decrease due to depreciation. Marco is studying the change in the price of two products, A and B, over time.
The price f(x), in dollars, of product A after x years is represented by the function below:
f(x) = 12500(0.82)x
Part A: Is the price of product A increasing or decreasing and by what percentage per year? Justify your answer. (5 points)
Part B: The table below shows the price f(t), in dollars, of product B after t years:
t (number of years) 1 2 3 4
f(t) (price in dollars) 5600 3136 1756.16 983.45
Which product recorded a greater percentage change in price over the previous year? Justify your answer.
Answer:
Part A:
The price of product A is determined by the function f(x) = 12500(0.82)^x. To determine whether the price is increasing or decreasing, we can look at the behavior of the function as x increases.
When x increases by 1 year, the value of the function is:
f(x+1) = 12500(0.82)^(x+1) = 10250(0.82)^x
To find the percentage change in price per year, we can calculate:
[(f(x+1) - f(x)) / f(x)] * 100%
= [(10250(0.82)^x - 12500(0.82)^x) / 12500(0.82)^x] * 100%
= -0.16 * 100%
= -16%
Therefore, the price of product A is decreasing by 16% per year.
Part B:
To determine which product recorded a greater percentage change in price over the previous year, we need to calculate the percentage change in price for each product from year to year.
For product B, the percentage change in price from year to year is:
From year 1 to year 2: [(f(2) - f(1)) / f(1)] * 100% = [(3136 - 5600) / 5600] * 100% = -43.14%
From year 2 to year 3: [(f(3) - f(2)) / f(2)] * 100% = [(1756.16 - 3136) / 3136] * 100% = -44.06%
From year 3 to year 4: [(f(4) - f(3)) / f(3)] * 100% = [(983.45 - 1756.16) / 1756.16] * 100% = -43.99%
For product A, we already determined that the percentage change in price per year is -16%.
Therefore, product A recorded a smaller percentage change in price over the previous year compared to product B.
Step-by-step explanation:
Last year, the results of a survey at one college suggested that 28% of students smoked regularly. This year, after an intensive college-wide anti-smoking campaign, a researcher wishes to investigate whether the proportion of smokers has changed. Let p represent the proportion of students who smoke regularly today. State hypotheses for a significant test, letting the alternative hypothesis reflect the possibility that the proportion of students who smoke today is different from the proportion last year.
The hypotheses can be written as:
H0: p = 0.28
Ha: p ≠ 0.28
The null hypothesis (H0) is that the proportion of students who smoke regularly today (p) is equal to the proportion of students who smoked regularly last year (0.28). The alternative hypothesis (Ha) is that the proportion of students who smoke regularly today is different from 0.28.
This is a two-tailed test, as we are looking for a difference in either direction from the proportion found last year. A significance level (α) should be chosen in advance to determine the level of risk that we are willing to accept of rejecting the null hypothesis when it is actually true. Typically, a significance level of 0.05 is used, which means that we are willing to accept a 5% chance of making a type I error (rejecting the null hypothesis when it is actually true).
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A researcher interviews 6 widows about their marriages and notices how many cats are wandering around. Is there a significant relationship between the number of times an old widow was married and the number of cats the old lady owns? ( You don't need to do the math to calculate it - the Pearson r is given).
Times Married: 1 1 2 2 3 3
Cats Owned: 3 2 4 5 5 6
Pearson r = +.91
Write up the conclusion for this study in APA format and be sure to include the r2.
There is a significant relationship between the number of cats she owns and the number of times an old widow was married (r = +0.91, p < 0.05, r² = 0.82).
Given, the Pearson correlation coefficient of +0.91,
There appears to be a strong +ve correlation between the number of cats she owns and the number of times an old widow was married.
It suggests that the more times a widow was married,the more cats she tends to own.
Approximately 82% of the variance in the number of cats owned can be explained by the number of times a widow was married is indicated by the coefficient of determination (r²).
Hence, we can say that there is a significant relationship between the number of cats she owns and the number of times an old widow was married (r = +0.91, p < 0.05, r² = 0.82).
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If (xn) is a convergent sequence and (yn) is such that for any ϵ>0,∃M such that |xn−yn|<ϵ,∀n≥M. Is (yn) convergent?
According to the given information, (yn) is convergent.
What is the convergence and divergence of the sequence?
Convergence: A sequence approaches a fixed number as the number of terms increases.
Divergence: A sequence does not approach a fixed number as the number of terms increases.
Yes, (yn) is convergent.
Since (xn) is a convergent sequence, it has a limit L, which means that for any ε > 0, there exists an N such that |xn - L| < ε for all n ≥ N.
Now, let ε > 0 be given. Then, there exists an M such that |xn - yn| < ε for all n ≥ M.
Combining these two inequalities, we have:
|yn - L| = |yn - xn + xn - L|
≤ |yn - xn| + |xn - L|
< ε + ε (for all n ≥ M)
Therefore, we have shown that for any ε > 0, there exists an M such that |yn - L| < 2ε for all n ≥ M.
Since 2ε can be made arbitrarily small by choosing ε small enough, this implies that (yn) converges to L, the limit of (xn).
Hence, (yn) is also convergent.
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(Q1) Given: m∠MNO=50∘;MP¯⊥MN¯;OP¯⊥ON¯;MP=OPWhat is the measure of ∠MNP ?By which Theorem?
The measure of angle MNP is 180 - angle MPO - angle NPM = 80 degrees. Perpendicular Bisector Theorem can be used to find the measure of angle NPM.
What is Perpendicular Bisector Theorem?
The Perpendicular Bisector Theorem states that if a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segment.
Conversely, if a point is equidistant from the endpoints of a segment, then it lies on the perpendicular bisector of the segment. In other words, the perpendicular bisector of a segment is the set of all points that are equidistant from the endpoints of the segment.
We can use the theorem that states "If a line is perpendicular to two intersecting lines at their point of intersection, then it divides the angles into two congruent angles." This theorem is called the Perpendicular Bisector Theorem.
Using this theorem, we know that angle MPO and angle NPM are congruent. We also know that angle MPO and angle NOO are supplementary (since OP is perpendicular to ON). Therefore, we can find the measure of angle NPM as follows:
angle MPO = angle NPM (by the Perpendicular Bisector Theorem)
angle MPO + angle NOO = 180 degrees (by the definition of supplementary angles)
angle NOO = 180 - angle MPO = 180 - 50 = 130 degrees
angle MPO = angle NPM
angle NPM = angle MPO = 50 degrees
Therefore, the measure of angle MNP is 180 - angle MPO - angle NPM = 80 degrees.
We can use the Perpendicular Bisector Theorem to find the measure of angle NPM.
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two distinct lines pass through the center of three concentric circles of radii 3, 2, and 1. the area of the shaded region in the diagram is 8/13 of the area of the unshaded region. what is the radian measure of the acute angle formed by the two lines?
The measure of acute angle is π/7
Area of a Sector of Circle:
The area of a sector of a circle is a fraction of the circle's total area, proportional to the measure of the central angle that subtends the sector.
The formula to calculate the area of a sector of a circle is:
=> A = (θ/360) × πr²
Where: A is the area of the sector
θ is the measure of the central angle in degrees
r is the radius of the circle
We can use this formula to calculate the area of the sector in the given problem
Here we have
Two distinct lines pass through the center of three concentric circles of radii 3, 2, and 1. The area of the shaded region in the diagram is 8/13 of the area of the unshaded region.
Let the area of the shaded part is 'S' and 'U' be the area of the unshaded part and the acute angle formed by the two lines be 'θ'
Hence, we can take => S + U = 9π
From the data, S = 8/13 U
=> 8/13 U + U = 9π
=> 21/13 U = 9π
=> 9π = 21/13 U
=> U = 117/21 π
=> U = 39π/7 and S = 24π/7
Now write the area of the shaded region in terms of θ
=> 2θ/2π · π + 2(π - θ)/2π (4π - π) + 2θ/2π (9π - 4π) = 24π/7
=> θ + 3π - 3θ + 5θ = 24π/7
=> 3θ + 3π = 24π/7
=> 3θ = 24π/7 - 3
=> 3θ = 24π - 21π/7
=> 3θ = 3π/7
=> θ = π/7
Therefore,
The measure of acute angle is π/7
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PLEASE HELP ASAP
Use the given information to complete parts I and II. In your final answer, include all calculations.
Mars has an approximate diameter of 6.794 · 10 9 millimeters. The sun has a diameter of 1.391 · 10 6 kilometers.
Part I: Given that for every one kilometer there are 1,000,000 millimeters, which unit of measurement should be used to best represent the lengths of the sun and Mar's diameters?
Part II: Use estimation to approximate how many times greater the sun’s diameter is than planet Mars’s.
Part I. The unit of measurement that should be used is kilometers.
Part II. The Sun's diameter is 204.74 times greater than that of the Mars.
What is unit of measurement?The unit of measurement is a representation that describe the type of quantity expressed. It can be used to determine if a given quantity is a dimensional or dimensionless.
From the given information,
Part I: The appropriate unit of measurement that should be used to best represent the diameters of the Sun and Mars is kilometers.
Part II: Given that;
Diameter of Mars = 6.794 x 10^9 mm
= 6.794 x 10^3 km
Diameter of Sun = 1.391 x 10^6 km
Then,
ratio of Sun's diameter to that of Mars = (1.391 x 10^6)/ (6.794 x 10^3)
= 204.74
Thus, the Sun's diameter is 204.74 times than that of Mars.
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a cylinder has a right cone removed from it as shown. both the cylinder and cone have a radius of 5 cm, a height of 5 cm, and their bases exactly correspond. find the area of a cross section of the shape that is formed by the intersection of the solid and a plane parallel and 2 inches above the base.
The area of a cross section of the shape formed by the intersection of the solid and a plane parallel and 2 inches above the base is 20.93 cm².
Calculate the area of the cylinder.
A cylinder's surface area is determined by multiplying its base circumference by its height.
2r, where r is the cylinder's radius (5 cm), equals the circumference of the cylinder.
Therefore, the area of the cylinder is 2πr x 5 cm = 2π x 5 cm2 = 31.4 cm².
Calculate the area of the cone.
A cone's area is determined by multiplying its height by a factor of three times the base's radius.
2r, where r is the cone's radius (5 cm), equals the circumference of the cone.
Therefore, the area of the cone is 1/3 x 2πr x 5 cm = 2π x 5 cm2 / 3 = 10.47 cm².
Determine the cross section area.
The area of the cylinder less the area of the cone equals the area of the cross section.
Therefore, the area of the cross section is 31.4 cm2 - 10.47 cm2 = 20.93 cm².
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which is closest to the probability that chris's guess ends up being exactly 4 less than the result?
The probability that Chris's guess ends up being exactly 4 less than the result is approximately 0.5. So, the correct option is c).
The possible values of X are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. The expected value of X can be calculated as
E(X) = (1/6) x 2 + (1/6) x 3 + (1/6) x 4 + (1/6) x 5 + (1/6) x 6 + (1/6) x 7 + (1/6) x 8 + (1/6) x 9 + (1/6) x 10 + (1/6) x 11 + (1/6) x 12
E(X) = 7
To be 4 less than the result, Chris's guess must be X - 4. Therefore, Chris's guess can be 2, 3, 4, 5, 6, 7, 8, 9, or 10.
The probability that Chris's guess ends up being exactly 4 less than the result can be calculated by finding the sum of the probabilities of getting X = 6, 7, or 8, since these are the only values of X that satisfy the condition that X - 4 is one of Chris's possible guesses
P(X = 6) = 5/36
P(X = 7) = 6/36
P(X = 8) = 5/36
P(Chris's guess is X - 4) = P(X = 6) + P(X = 7) + P(X = 8)
P(Chris's guess is X - 4) = 16/36
P(Chris's guess is X - 4) ≈ 0.44
Therefore, the closest answer choice is 0.5. So, the correct answer is c).
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--The given question is incomplete, the complete question is given
" Suppose that you will roll 2, fair 6-sided dice (assume a Laplace probability model), and let X represent the sum of the results of the two rolls. Your friend Chris makes a guess for the value of X, using the expected value. Which is closest to the probability that Chris's guess ends up being exactly 4 less than the result? 0, 0.15, 0.5, 2, 7, 12"--
. suppose people are born in any of the twelve months of the year with equal probability. what is the probability that at least two of the people in a group of n people are born in the same month? what is the smallest value of n for which this is more than .5?
The probability of the first person having a birthday in any month is 1 (12/12). For the second person, to have a different birth month, the probability is 11/12. For the third person, it's 10/12, and so on. The smallest value of n for which the probability of at least two people sharing the same birth month is more than 0.5 is 5.
The probability that two people in a group of n people are born in the same month can be calculated using the formula:
1 - (12/12) * ((11/12)^(n-1))
This formula represents the probability of the first person being born in any of the 12 months (12/12), and the probability of the second person being born in a different month than the first (11/12). We raise this probability to the power of (n-1) because we are looking for the probability that none of the first n-1 people share a birth month, and then subtract this value from 1 to get the probability that at least two people share a birth month.
To find the smallest value of n for which this probability is more than .5, we can solve the equation:
1 - (12/12) * ((11/12)^(n-1)) > 0.5
Simplifying this equation gives:
(11/12)^(n-1) < 0.5/12
Taking the logarithm of both sides and solving for n gives:
n > log(0.5/12) / log(11/12) + 1
n > 17.43
Therefore, the smallest value of n for which the probability of at least two people sharing a birth month is more than .5 is n = 18.
To answer your question, we can use the concept of complementary probability. Instead of directly finding the probability of at least two people having the same birth month, we'll first find the probability of all people having different birth months and then subtract it from 1.
Let's consider n people. The probability of the first person having a birthday in any month is 1 (12/12). For the second person, to have a different birth month, the probability is 11/12. For the third person, it's 10/12, and so on.
So, the probability of all n people having different birth months is:
P(different) = (12/12) * (11/12) * (10/12) * ... * (12-n+1)/12
The probability of at least two people having the same birth month is:
P(at least two same) = 1 - P(different)
Now, we need to find the smallest value of n for which P(at least two same) > 0.5.
You can check different values of n starting from 1, but you will find that for n = 5:
P(different) ≈ 0.492
P(at least two same) ≈ 1 - 0.492 = 0.508
So, the smallest value of n for which the probability of at least two people sharing the same birth month is more than 0.5 is 5.
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Question 1
Solve the inequality x -2 ≤-5. Plot the solution with ei-
ther an open or closed dot.
*Hint: One of the groundhogs is at the correct spot.
Answer:The number line should look like this:
<-----o----->
-3
Step-by-step explanation:
To solve the inequality x - 2 ≤ -5, we can follow these steps:
Add 2 to both sides of the inequality to isolate x on one side:
x - 2 + 2 ≤ -5 + 2
x ≤ -3
The solution to the inequality is x ≤ -3, which means that x is less than or equal to -3.
To plot the solution on a number line, we can place a closed dot on -3 to represent the "less than or equal to" condition, indicating that -3 is included in the solution set.
The number line should look like this:
<-----o----->
-3
The closed dot on -3 indicates that -3 is included in the solution set.
Quadrilateral ABCD is an isosceles trapezoid with AC=BC The base angles are
Quadrilateral ABCD is an isosceles trapezoid with AC=BC The base angles are <A and <D, as well as <B and <C
∠A and ∠D, as well as ∠B and ∠C.
In Euclidean geometry, an isosceles trapezoid is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides. It is a special case of a trapezoid. Alternatively, it can be defined as a trapezoid in which both legs and both base angles are of the same measure.
Hence, the two bases of trapezoid are:
AD and BC.
Hence, the base angles are:
∠A and ∠D, as well as ∠B and ∠C.
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What is the length of AB?
[tex]\sin( 30^o )=\cfrac{\stackrel{opposite}{AB}}{\underset{hypotenuse}{16}} \implies 16\sin(30^o)=AB \implies 8= AB[/tex]
A cube has sides of length 2 meters. Explain what happens to the volume of the cube if the length of the sides is doubled. Aplanation.
Answer:
The value of the new cube's volume is the old value squared. (y = (8)^2)
Step-by-step explanation:
2*2*2 = 8
4*4*4 = 64
speed is measured by the time required to run a distance of 40 yards, with smaller times indicating more desirable (faster) speeds. from previous speed data for all players in this position, the times to run 40 yards have a mean of 4.60 seconds and a standard deviation of 0.15 seconds, with a minimum time of 4.40 seconds, as shown in the table below. time to run 40 yards mean 4.60 seconds standard deviation 0.15 seconds minimum 4.40 seconds based on the relationship between the mean, standard deviation, and minimum time, is it reasonable to believe that the distribution of 40-yard running times is approximately normal? explain.
the minimum time of 4.40 seconds is not significantly far from the mean of 4.60 seconds, which further supports the normality assumption.
It is reasonable to believe that the distribution of 40-yard running times is approximately normal based on the central limit theorem, which states that the distribution of sample means tends to be normal, regardless of the underlying population distribution, as long as the sample size is sufficiently large. In this case, we are given the mean and standard deviation for all players in the position, which suggests that the population distribution is approximately normal.
what is second?
A second is a unit of time. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom.
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Simplify the following expression.x-1
Answer:x-1
Step-by-step explanation: the expression is already simplified.
draw two normal curves that have the same mean but different standard deviations. describe the similarities and differences.
Two normal-curves with similar forms but distinct spreads will have the same mean but different standard deviations.
Since the centre of a normal distribution is determined by the mean, the centre of both curves on the horizontal axis will be the same. The spread of a normal distribution is, nevertheless, determined by its standard deviation. A smaller standard deviation indicates that the distribution is more tightly concentrated around the mean, whereas a bigger standard deviation indicates that the distribution is more dispersed.
Since extreme values are more likely to occur, the normal curve with the larger standard deviation will have more area under the curve in the tails. Extreme values are less likely to occur for the normal curve with the smaller standard deviation, which will have less area under the curve in the tails.
When compared to a normal curve with a smaller standard deviation, the larger standard deviation normal curve will visually appear wider and flatter. Both curves will have a bell-shaped curve with the highest point at the mean that is symmetrical around the mean.
Similarities:
The mean of both normal curves, which symbolises the distribution's centre, will be the same.
The mean will be the centre of symmetry for both normal curves.
The area under the curve for both normal curves will be equal to one.
Differences:
Greater standard deviation results in a wider normal curve than smaller standard deviation does.
The data will be more dispersed over the normal curve with a higher standard deviation, whereas the data will be more firmly grouped along the normal curve with a smaller standard deviation.
The peak of the normal curve with a higher standard deviation will be flatter than the peak of the normal curve with a lower standard deviation.
Overall, the two normal curves are comparable in that they both have the same mean, but they differ mostly in terms of their standard deviation, which has an impact on both their spread and the possibility of extreme values.
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Determine whether the system has one solution, no solution, or infinitely many solutions.
The system of equation, 2x + 3y = - 6 , -4x - 6y = 12 has infinitely many solution.
How to solve system of equation?System of equation can be solved using different method such as elimination method, substitution method and graphical method. Let's solve the system of equation by elimination method.
Let's determine if the equation have a solution or not.
Therefore,
2x + 3y = - 6
-4x - 6y = 12
Hence, multiply equation(i) by 2
4x + 6y = -12
-4x - 6y = 12
add the equations
0 = 0
Therefore, the equation has infinitely many solutions.
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Solve the following system by graphing and identify the point of intersection.
-2x-y=-12
2x-3y=4
O (2,5)
O (5,2)
O (-5,-2)
O (-2,-5)
Answer:
(b) (5, 2)
Step-by-step explanation:
You want the point of intersection of the lines defined by ...
-2x -y = -122x -3y = 4GraphThe attachment shows a graphical solution to the system of equations.
The point of intersection is (5, 2), choice B.
__
Additional comment
It is convenient to graph the first equation using its intercepts. The x-intercept is the solution with y=0:
-2x = -12 ⇒ x = 6
The y-intercept is the solution with x=0:
-y = -12 ⇒ y = 12
The line through these intercept points is the red line in the attachment.
The second equation has an x-intercept easy to find and graph:
2x = 4 ⇒ x = 2
The y-intercept is negative (-4/3), so the line will have an upward slope at x=2. It must cross the first line between x=2 and x=6, eliminating all answer choices except the correct one.
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is it possible to create two 6 sided dice that labeled with different numbers than the standard dice, but have the same probabilities of getting each sum as the standard dice, e.g. the probability of a sum of 2 is 1/36, the probability of a sum of 3 is 2/36, etc.? you can repeat numbers on your dice.
Yes, it is possible to create two 6-sided dice with different numbers than the standard dice
What is probability?
The probability formula involves dividing the number of favorable outcomes by the total number of possible outcomes to determine the probability of an event. The probability of an event ranges from 0 to 1, as the number of favorable outcomes cannot exceed the total number of outcomes.
One example of such a pair of dice is:
Die 1: 1, 1, 2, 3, 3, 4
Die 2: 1, 2, 2, 3, 4, 4
The probabilities of getting each sum with these dice are:
Sum 2: 1/36
Sum 3: 2/36
Sum 4: 3/36
Sum 5: 4/36
Sum 6: 5/36
Sum 7: 6/36
Sum 8: 5/36
Sum 9: 4/36
Sum 10: 3/36
Sum 11: 2/36
Sum 12: 1/36
These probabilities match the probabilities of getting each sum with standard dice, even though the numbers on these dice are different.
Hence, Yes, it is possible to create two 6-sided dice with different numbers than the standard dice
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the functions f is defined on the open interval 0.4 < x < 2.4 and has first derivative f' given by f'(x)
what conclusions can you draw from residual analysis? the plot suggests curvature in the residuals leading us to question the assumption of a linear relationship between x and y
Residual analysis is an important tool in statistical analysis to evaluate the goodness of fit of a linear regression model. It helps to identify any systematic patterns in the differences between the observed values and the predicted values.
A residual plot is a graph that shows the residuals (vertical distances) of the data points from the regression line on the horizontal axis. If the residual plot shows a linear pattern, it suggests that the linear regression model is a good fit for the data.
However, if the plot suggests curvature in the residuals, it raises a concern about the assumption of a linear relationship between x and y. In this case, we may need to consider fitting a non-linear model that accounts for the curvature.
Furthermore, residual analysis can also help to identify outliers or influential points that may be affecting the model's performance. Outliers are data points that are far away from the rest of the data, while influential points are observations that have a large effect on the slope or intercept of the regression line.
In conclusion, residual analysis is a powerful tool for evaluating the fit of a linear regression model. By examining the residual plot, we can draw important conclusions about the linearity or curvature of the relationship between x and y, and identify any outliers or influential points that may be affecting the model's performance.
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Refer to your answers to the questions from Part 2 of Project 1.
A parabola goes through (negative 2, negative 5) & (6, negative 1). A point is above the parabola at (2, negative 4). A line below the parabola goes through (0, negative 6) & (2, negative 6). A point on the parabola is labeled (x, y).
What is the correct standard form of the equation of the parabola?
Enter your answer below. Be sure to show each step of your work.
The correct standard form of the equation of the parabola is y = 1/4(x - 2)² - 5.
How to determine the equation of a parabola?In Mathematics, the standard form of the equation of the directrix lines for any parabola is given by this mathematical expression:
y = a(x - h)² + k.
Where:
h and k are the vertex.a is a point.Since the directrix is horizontal, the axis of symmetry would be vertical. Based on the graph, we have the following points;
directrix y = -6
Vertex (h, k) = (2, -5)
Focus (h, k + 1/4a) = (2, -4)
k + 1/4a = -4
-5 + 1/4a = -4
1/4a = 1
a = 1/4.
Therefore, the quadratic function (equation) for this parabola is given by;
y = a(x - h)² + k.
y = 1/4(x - 2)² + (-5).
y = 1/4(x - 2)² - 5
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(L1) Given: AD¯⊥BA¯;CD¯⊥BC¯;AD¯≅CD¯Prove: BD¯ bisects ∠ABC
BD bisects ∠ABC at its midpoint.
To prove that BD bisects ∠ABC, we need to show that BD intersects AC at its midpo
Since AD¯⊥BA¯ and CD¯⊥BC¯, we can conclude that ABCD is a parallelogram. Therefore, AB || CD and AD || BC.
Since AD¯≅CD¯, we can conclude that ABCD is a rhombus, and the diagonals of a rhombus bisect each other at right angles. Therefore, AC is perpendicular to BD.
Let E be the point of intersection of BD and AC. We need to show that AE = EC.
Consider the triangles ABE and CBE. These triangles share a common base BE and have congruent angles at B because AB || CD. Therefore, they are similar triangles.
Since AD¯≅CD¯, the corresponding sides of triangles ABE and CBE are in the same ratio. In particular, AE/EC = AB/BC.
Since ABCD is a rhombus, we have AB = BC, and therefore AE = EC.
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Assume there are 11 homes In the Quall Creek area and 4 of them have a security system. Three homes are selected at random:What Is the probability all three of the selected homes have a security system?
The probability that all three of the selected homes have a security system is approximately 0.0242 or 2.42%.
What is probability?
Probability is a measure of the likelihood of an event occurring. It is a number between 0 and 1, where 0 means the event is impossible and 1 means the event is certain to happen.
The probability that the first home selected has a security system is 4/11, since there are 4 homes with a security system out of 11 total homes.
Assuming that the first home selected does have a security system, the probability that the second home selected also has a security system is 3/10, since there are now only 3 homes with a security system remaining out of 10 total homes.
Similarly, assuming that the first two homes selected have security systems, the probability that the third home selected also has a security system is 2/9, since there are now only 2 homes with a security system remaining out of 9 total homes.
To find the probability that all three homes selected have security systems, we multiply these probabilities together:
(4/11) * (3/10) * (2/9) = 0.0242 or approximately 2.42%.
Therefore, the probability that all three of the selected homes have a security system is approximately 0.0242 or 2.42%.
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PLS HURRY IM BEING TIMED!!! which graph shows a positive slope?
Answer: A
Step-by-step explanation:
PLEASS HELPPP
What is the area of the figure
Answer: 64.2 ft^2
Step-by-step explanation: to find the answer we know that the parallelogram area is A= bh we see that they are trying to trick us by separating the base we have to add the base together and we then get 10.7 that is the base we then see that the height is 6 and we multiply them together and get the answer.
pls pls help asap... im not very good at math
The correct option is the second one, the quadratic equation is:
f(x) = 1 - 8x²
Which one is a quadratic equation?A quadratic equation is a polynomial where the degree is 2.
So, we only have integer exponents and the larger exponent is 2.
For example, in the first equation we can see that, but the coefficient of the term with the exponent of 2 is zero, so that term is zero, and thus, that is a linear equation.
The option that is quadratic is the second one:
f(x) = 1 - 8x²
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This figure represents a small doorstop. The plan is to paint 40% of the total surface area, including the bottom face, of the doorstop with blue paint.
How much surface area will be painted blue?
A. 6200 cm²
B. 3720 cm²
C. 2232 cm²
D. 1488 cm²
The surface area painted blue will be 1,488 square cm.
The correct option is: (D)
What is surface area?Surface area is the amount of space covering the outside of a three-dimensional shape.
We have, The plan is to paint 40% of the total surface area.
The surface area is :
Surface Area = (17 + 17 + 18 + 30 + 18) x 24 + 8 x 30 + 2 x 30 x 18
Surface Area = 100 x 24 + 8 x 30 + 60 x 18
Surface Area = 2400 + 240 + 1080
Surface Area = 3720 square cm
Blue paint will be applied to 40% of the overall surface area of the doorstop, including the bottom face then
= 0.40 x 3720
= 1488 square cm
Therefore, the surface area painted blue will be 1,488 square cm.
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