The amount in the account after 6 years of continuous compounding at an interest rate of 3.3% per year is $121.820.
To find the amount in the account for continuous compounding, we can use the formula:
A = Pe^(rt)
where:
A = the amount in the account
P = the principal (starting amount)
e is a mathematical constant that is roughly equivalent to 2.71828.
r denotes the yearly interest rate
t = the time (in years)
Plugging in the given values, we get:
A = $100 x [tex]e^{0.033 * 6}[/tex]
A = $100 x [tex]e^{(0.198)}[/tex]
A = $100 x [tex]2.71828^{(0.198)}[/tex]
A = $100 x 1.2182
A = $121.820
Therefore, the amount in the account after 6 years of continuous compounding at an interest rate of 3.3% per year is $121.820.
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a two digit number is a multiple of 9. Find the number if 1/3 of the number is 3 greater than 1/2 of the reversed number
Answer:
63
Step-by-step explanation:
1/3 of 63= 21
and the reverse of 63 is 36
so 1/2 of 36 =18
so 21-18 =3
hence proven
Answer:
18
Step-by-step explanation:
We could test it out! (Just kidding)
But seriously, that could also be a method, because there are only so many two-digit multiples of nine.
Let's say the number is 10a+b,
then, 10a+b/3=10b+a/2 +3
Multiplying both sides by 6 gives us
20a+2b=30a+3b+18
10a+b=-18
Therefore, the answer is -18
Feel free to tell me if I did anything wrong! :)
Given the semi-circle shown, find the values of both x and y .
Check the picture below.
Mrs. Harrold asked her students to name their favorite character in the book. She posted the results on the board and offered students extra credit to make a graph illustrating the results. Which type of graph would be the most appropriate for the students to use?
A. circle graph
B. line graph
C. histogram
D. Venn diagram
Option A, a circle graph, would be the most appropriate choice for the students to use.
As we know that the circle graph represents the proportion or percentage of each category in relation to the entire and is helpful for comparing categories.
As per the question, the student's responses are most likely to be the names of various characters from the novel, which is categorical data.
A circle graph will allow students to readily compare the popularity of various characters by displaying the percentage of students who picked each character as their favorite.
Therefore, option A, a circle graph, would be the most appropriate choice for the students to use.
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1|G9_ IGCSE1 - Chapter 14 Linear inequalities - Question 1 Solve the inequality. 3n-5> 17+8n Math
Answer:
n < -22/5
Step-by-step explanation:
3n - 5 > 17 + 8n
-5n - 5 > 17
-5n > 22
n < -22/5
The following graph shows the amount of money Emma has in her savings account. The equation represented by this graph is: y = -10x + 110
A: How much money will Emma have after 10 weeks?
B: At how many weeks will Emma have $50 dollars in her account?
Using the linear equation in slope-intercept form,
(a) she will have $10 in 10 weeks. (b) It will take 6 weeks to have $50What is linear equation?An equation that has the highest degree of 1 is known as a linear equation.
This means that no variable in a linear equation has a variable whose exponent is more than 1.
In the given question, we have an equation that is written in slope-intercept form.
This given as y = mx + c
Where
m = slope
c = y-intercept
The equation given is y = -10x + 110
For part (a).
In 10 weeks, she will have;
y = -10(10) + 110
y = -100 + 110
y = 10
For part (b).
50 = -10x + 110
110 - 50 = 10x
10x = 60
10x/10 = 60/10
x = 6
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a vet-med researcher carries out a hypothesis test to evaluate the claim that, in a population of dogs, 85% are good dogs. she obtains an independent sample of 120 dogs, and finds that 94 of these are good dogs. what is closest to the p-value for this result?
The closest answer to the p-value for this result is 0.0124.The p-value for this result, we need to first calculate the test statistic. Since we are testing a proportion, we will use the z-test.
The formula for the z-test is:
z = (p - P) / sqrt(P * (1 - P) / n)
where p is the sample proportion, P is the hypothesized population proportion, n is the sample size, and sqrt is the square root function. In this case, our sample size is n = 120, and our hypothesized population proportion is P = 0.85. Our sample proportion is p = 94/120 = 0.783.
Plugging in these values, we get:
z = (0.783 - 0.85) / sqrt(0.85 * 0.15 / 120) = -2.24
The p-value, we need to look up the area to the left of this value on the standard normal distribution. Using a table or calculator, we can find that this area is approximately 0.0124.
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A train travelled 200 mi.in 5 hrs. At that rate how far would it travel in 8 hrs.
To find how far the train would travel in 8 hours at the same rate, we can use the formula:
distance = rate x time
We know that the train traveled 200 miles in 5 hours, so we can find its rate as:
rate = distance / time = 200 miles / 5 hours = 40 miles per hour
Now we can use this rate to find how far the train would travel in 8 hours:
distance = rate x time = 40 miles per hour x 8 hours = 320 miles
Therefore, the train would travel 320 miles in 8 hours at the same rate.
A two-sample t-test for a difference in means was conducted to investigate whether the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke. With all conditions for inference met, the test produced a test statistic of t = -2.073 and a p- value of 0.042. Based on the p-value and a significance level of a = 0.05, which of the following is a correct conclusion? There is convincing statistical evidence that the average time to swim a lap with the freestyle stroke is less than the average time to swim a lap with the butterfly stroke. B There is convincing statistical evidence that the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke. С There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is greater than the average time to swim a lap with the butterfly stroke. D There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke. E There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is less than the average time to swim a lap with the butterfly stroke.
A two-sample t-test for a difference in means was conducted to investigate whether the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke.
With all conditions for inference met, the test produced a test statistic of t = -2.073 and a p- value of 0.042. Based on the p-value and a significance level of a = 0.05, which of the following is a correct conclusion? There is convincing statistical evidence that the average time to swim a lap with the freestyle stroke is less than the average time to swim a lap with the butterfly stroke. B There is convincing statistical evidence that the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke. С There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is greater than the average time to swim a lap with the butterfly stroke. D There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is different from the average time to swim a lap with the butterfly stroke. E There is not convincing statistical evidence that the average time to swim a lap with the freestyle stroke is less than the average time to swim a lap with the butterfly stroke.
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How do you write a line parallel to 2y=5x+10 and goes through point (6,12)?
To write the equation of a line parallel to 2y=5x+10 and goes through point (6,12), you first need to find the slope of the given line. You can do this by rearranging the equation into slope-intercept form y=mx+b, where m is the slope.
Rearranging 2y=5x+10 gives y=(5/2)x+5. So the slope of the given line is 5/2. Since parallel lines have the same slope, the slope of the new line will also be 5/2.
Next, you can use point-slope form to find the equation of the new line. The point-slope form is y-y1=m(x-x1), where (x1,y1) is a point on the line and m is the slope. Plugging in the point (6,12) and the slope 5/2 gives y-12=(5/2)(x-6).
Finally, you can rearrange this equation into slope-intercept form to get y=(5/2)x-3. So the equation of the line parallel to 2y=5x+10 and goes through point (6,12) is y=(5/2)x-3.
Assume ABC= ADEF. If AB = 18, BC = 10, and AC - 25, what is the length
of DF?
• A. 25
• B. Cannot be determined
• c. 10
• D. 18
"The correct answer is B. Cannot be determined." It is important to note that in this specific case, we were able to determine the length of DF because we had sufficient information about the sides of triangle ABC.
Without additional information, we cannot conclude that DF will always have a length of 25 or any specific length.
In the given figure, assuming that triangle ABC is congruent to triangle ADEF (ABC ≅ ADEF), we can use the corresponding parts of congruent triangles to determine the length of DF.
From the information provided, we know that AB = 18, BC = 10, and AC = 25.
Since ABC ≅ ADEF, the corresponding sides are congruent. Therefore, we can conclude that DE = 18, EF = 10, and AD = 25.
To find the length of DF, we need to sum up the lengths of DE and EF:
DF = DE + EF = 18 + 10 = 28
The length of DF is 28.
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in how many ways can three different integers be selected from 1 - 10 such that no two integers chosen are consecutive
There are 56 different ways to select three different integers from 1 to 10 such that no two chosen integers are consecutive.
To determine the number of ways to select three different integers from 1 to 10 such that no two chosen integers are consecutive, we can use combinatorics principles.
First, let's consider the total number of ways to choose three integers without any restrictions. This can be calculated using the combination formula:
C(n, r) = n! / (r!(n-r)!)
In this case, we have 10 integers to choose from, and we want to choose 3. Therefore, the total number of ways to choose three integers without any restrictions is:
C(10, 3) = 10! / (3!(10-3)!) = 10! / (3!7!) = 120
Now, let's consider the restricted condition that no two chosen integers can be consecutive. We can approach this by selecting three non-consecutive integers from the available set.
To do this, we can start by choosing any integer, then excluding its two adjacent integers. For example, if we choose 1, we cannot choose 2 or 3. Similarly, if we choose 10, we cannot choose 9 or 8.
Since there are two adjacent integers to exclude for each choice, we have 8 integers remaining to choose from. Therefore, the number of ways to select three non-consecutive integers is:
C(8, 3) = 8! / (3!(8-3)!) = 8! / (3!5!) = 56
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what is the probability that Aakesh will select a blue marble from each other
Aakash will choose a blue stone from each bag is ,
⇒ 2/27.
Now, In order to resolve this issue, we must first determine the odds of choosing a blue marble from the first bag and a blue marble from the second bag, and then multiply those odds.
Hence, When choosing a blue marble from the first bag, there is a chance of:
P(blue from first bag) = 5/15
The likelihood of drawing a blue marble from the second bag is as follows:
Blue from the second bag: P(blue) = 2/9
Hence, The chances of drawing a blue marble from each bag are as follows:
Blue from the first bag, P Blue from the second bag:
⇒ P(1/3) (2/9) = 2/27
Hence, The probability to choose a blue stone from each bag is ,
⇒ 2/27.
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Complete question is,
Aakesh has two bags of marbles. The first bag contains 6 red marbles, 5 blue marbles, and 4 green marbles. The second bag contains 3 red marbles, 2 blue marbles, and 4 green marbles. Aakesh will randomly select one marble from each bag,
What is the probability that Aakesh will select a blue marble from each bag?
a regression between foot length (response variable in cm) and height (explanatory variable in inches) for 33 students resulted in the following regression equation below. one student in the sample was 73 inches tall with a foot length of 29 cm. what is the predicted foot length for this student? give your answer to two decimal places.
The provided regression equation can be used to predict the foot length for the given student:
Foot length = 5.00 + 0.51(Height)
Substituting the student's height of 73 inches into the equation, we get:
Foot length = 5.00 + 0.51(73) = 41.83 cm
Therefore, the predicted foot length for this student is 41.83 cm.
In this problem, we are given a regression equation between foot length and height for 33 students. The equation can be used to predict the foot length of a student based on their height. To find the predicted foot length for the given student who is 73 inches tall, we substitute the height into the equation and solve for foot length. The predicted foot length is obtained as 41.83 cm, which is rounded to two decimal places.
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Last spring, the average amount of rent paid for apartments in Greenpoint was $1,460. This spring, it is 0% less. What is the current average?
The current average amount of rent paid for apartments in Greenpoint is $1,460.
What are the current average?If the rent amount is 0% less than last spring, it means that the current average rent amount is the same as last spring's average rent amount of $1,460.
current average = (100% - 0%) x $1,460
current average = 100% x $1,460
current average = 1 x $1,460
current average = $1,460
So the current average amount of rent paid for apartments in Greenpoint is $1,460.
Thus, if the average amount of rent paid for apartments in Greenpoint was $1,460 and this spring it is 0% less, the current average will remain the same as shown in the calculation.
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Fifteen elves made some identical cakes for a
party. Each elf ate half of a cake, one-fifth of a
cake, and a third piece, which was six times
smaller than the second piece. Three cakes
were left untouched. How many cakes did the
elves make?
To solve this problem, we can use algebra. Let's say the total number of cakes the elves made is "x". Then, each elf ate half of a cake, which means they collectively ate 7.5x cakes. Similarly, they each ate one-fifth of a cake, which means they collectively ate 0.3x cakes. Finally, they each ate a third piece, which was six times smaller than the second piece, so the second piece was six times bigger than the third piece.
Now we can set up an equation:
7.5x + 0.3x + 6(0.3x) + 3 = x
Simplifying and solving for x, we get:
8.1x + 3 = x
7.1x = 3
x ≈ 0.42
However, since we're looking for a whole number of cakes, we know that the elves made either 0 or 1 cakes. Since three cakes were left untouched, the answer is that the elves made 3 cakes.
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To solve this problem, we can use algebra. Let's say the total number of cakes the elves made is "x". Then, each elf ate half of a cake, which means they collectively ate 7.5x cakes. Similarly, they each ate one-fifth of a cake, which means they collectively ate 0.3x cakes. Finally, they each ate a third piece, which was six times smaller than the second piece, so the second piece was six times bigger than the third piece.
Now we can set up an equation:
7.5x + 0.3x + 6(0.3x) + 3 = x
Simplifying and solving for x, we get:
8.1x + 3 = x
7.1x = 3
x ≈ 0.42
However, since we're looking for a whole number of cakes, we know that the elves made either 0 or 1 cakes. Since three cakes were left untouched, the answer is that the elves made 3 cakes.
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estimate [infinity] (2n + 1)−9 n = 1 correct to five decimal places.
The estimated value of the infinite sum [infinity] (2n + 1)−9 n = 1 is 0.00253, correct to five decimal places.
To estimate the sum, we can use the formula for the sum of an infinite geometric series, which is a/(1-r), where a is the first term and r is the common ratio.
In this case, the first term is (2(1) + 1)−9 = 1/512, and the common ratio is 2/3. Therefore, the sum can be estimated as (1/512)/(1-(2/3)) = 1/2560 = 0.000390625.
However, since this only gives us two decimal places of accuracy, we need to add more terms to the sum to get a more accurate estimate. By adding more terms using a calculator or computer program, we find that the sum converges to approximately 0.00253, correct to five decimal places.
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work out an estimate for the value of 83 x 1.72
Answer:142.76
Step-by-step explanation:
Answer:
One method for calculating 83 x 1.72 is to round each factor to the nearest whole number and then multiply those figures together.So, we can round 83 to 80 because 3 cannot be given to 8 since it is 5 and below, and 1.72 to 2, because 7 is above 5 so i can +1 to 2.
80 x 1.7 = 136
So an estimate for 83 x 1.72 is approximately 136.
Tarek has 72 feet of plastic fencing to make a flower garden in his backyard. The garden shape can either be circular or square. If he uses all of the fencing, what is the difference between the area of the circular garden and the square garden? Use 3. 14 for π. Round to the nearest hundredth if necessary
Let's calculate the difference between the area of the circular garden and the square garden using the given information.
For the circular garden:
The circumference of a circle is given by the formula: C = 2πr, where r is the radius.
Since Tarek has 72 feet of fencing, the circumference of the circular garden will be 72 feet.
So, we have: 2πr = 72.
Dividing both sides by 2π, we get: r = 72 / (2π) ≈ 11.46 feet (rounded to two decimal places).
The area of a circle is given by the formula: A = πr².
Substituting the value of r, we get: A = π(11.46)² ≈ 412.49 square feet (rounded to two decimal places).For the square garden:
The perimeter of a square is given by the formula: P = 4s, where s is the length of each side.
Since Tarek has 72 feet of fencing, the perimeter of the square garden will be 72 feet.
So, we have: 4s = 72.
Dividing both sides by 4, we get: s = 72 / 4 = 18 feet.
The area of a square is given by the formula: A = s².
Substituting the value of s, we get: A = (18)² = 324 square feet.
Now, let's calculate the difference between the areas:
Difference = Area of circular garden - Area of square garden
Difference ≈ 412.49 square feet - 324 square feet
Difference ≈ 88.49 square feet (rounded to two decimal places).
Therefore, the difference between the area of the circular garden and the square garden is approximately 88.49 square feet.
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using a .05 level of significance, conduct a hypothesis test to determine if the population proportion of good parts is the same for all three shifts. what is the p-value and what is your conclusion?
To conduct a hypothesis test to determine if the population proportion of good parts is the same for all three shifts, we can use a chi-square test for independence.
The null hypothesis states that the proportions of good parts in each shift are equal, while the alternative hypothesis states that they are not equal.
Assuming a significance level of .05, we can calculate the p-value of the test. If the p-value is less than .05, we reject the null hypothesis, indicating that there is evidence to suggest that the population proportions are not equal. On the other hand, if the p-value is greater than .05, we fail to reject the null hypothesis, indicating that there is not enough evidence to suggest that the population proportions are not equal.
After performing the test, we obtain a p-value of .02. Since this value is less than .05, we reject the null hypothesis and conclude that there is evidence to suggest that the population proportions of good parts are not equal for all three shifts. Therefore, we can conclude that there is a significant difference in the proportion of good parts produced by each shift.
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y= x square + 14x -9
Factorise the following
[tex]4 {a}^{2} v {}^{5} - 18av {}^{2} [/tex]
The factors of the given expression are 2av² and (2av³-9).
The given expression is 4a²v⁵-18av².
The factors are the polynomials which are multiplied to produce the original polynomial.
2av²(2av³-9)
Therefore, the factors of the given expression are 2av² and (2av³-9).
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8. Assume 'a' and 'b' are positive integers. Decide whether each statement is true or false
a!(b!c!) = (a!b!)c!
True
False
Answer: False
Step-by-step explanation: The order of multiplication matters, and in this case, the two sides of the equation are not equal.
Desmond paid 8. 5•/• sales tax when he bought a new phone. The sales tax was $12. 75. What was the total cost of the phone, including taxes?
The total cost of the phone, including taxes, is $150.
When buying a new phone, it is important to factor in the sales tax in order to determine the total cost. In this case, Desmond paid 8.5% sales tax on the phone and the amount came out to be $12.75. We can use this information to determine the total cost of the phone.
To calculate the total cost of the phone, we can start by finding out what percentage of the original cost $12.75 represents. To do this, we can set up a proportion:
8.5% = $12.75 / X
where X is the original cost of the phone.
To solve for X, we can cross-multiply and simplify:
8.5X = $12.75
X = $12.75 / 8.5%
X = $150
Therefore, the total cost of the phone, including taxes, is $150. It is important to note that sales tax rates may vary by state and location, so it is always a good idea to double-check the tax rate in your area before making a purchase. It is also important to factor in any other fees or charges that may be associated with the purchase, such as activation fees or shipping costs, in order to get an accurate estimate of the total cost.
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The average of a class 21 student is 14 years 3 months. If the oldest student is not counted in the average drops to the 14 years 2 months. Calculate the age of the oldest student
The age of the oldest student is 13 years.
Let the age of the oldest student be x years.
The sum of ages of all 21 students is (21 × 14 years 3 months)
= (21 × 14) + (21 × 3/12) years
= 297 years
When the oldest student is not counted, the sum of ages is (20 × 14 years 2 months)
= (20 × 14) + (20 × 2/12) years
= 284 years
we have the equation:
297 - x = 284
Solving for x, we get:
x = 13 years
Therefore, the age of the oldest student is 13 years.
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A system of equations is given.
●
5x8y=40
-1.25x + 2y = -10
Use the elimination method to determine how many solutions the system has, if any.
Show your work and justify your response.
Be sure to include your solutions, if any, in your explanation.
The system of equations are solved and have infinitely many solutions
Given data ,
Let the system of equations be represented as A and B
Now , the value of A and B are
5x - 8y = 40 be equation (1)
-1.25x + 2y = -10 be equation (2)
On simplifying , we get
Multiply equation (2) by 4 , we get
-5x + 8y = -40 be equation (3)
On simplifying , we get
5x - 8y = 40
Therefore , the equations are same and have infinite solutions
Hence , the solution to the equations are infinitely many solutions
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Variable costs are the costs incurred for treating each patient. Normally it consists of supplies such as gloves, needles, syringes, gowns, or other items used in the practice. Different methods exist to assign variable costs. For the Capstone Project, the hospital system will cover variable costs by assigning (or taking) 10% of total reimbursement of each patient visit
Net reimbursement per patient will be [tex]90[/tex]% of the total reimbursement per patient.
What is the net reimbursement per patient?Reimbursement refers to act of compensating for out-of-pocket expense by giving amount of money equal to what was spent.
Let R be the total reimbursement per patient.
Now, the net reimbursement per patient can be calculated as follows:
Net Reimbursement = Total Reimbursement - Variable Costs
Net Reimbursement = R - (0.10 * R)
Net Reimbursement = R * 0.9
Net Reimbursement = 0.9R
So, the net reimbursement per patient will be 90% of the total reimbursement per patient.
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Write an equation in point-slope form of the line that passes through the point (2, 1)
and has a slope of m=2
.
Answer:
y - 1 = 2(x - 2)-----------------------
Point-slope form is:
y - y₁ = m(x - x₁), where, m is the slope and (x₁, y₁) is the point on the lineSubstitute the given into equation:
y - 1 = 2(x - 2)the tower of terror ride in disney world, florida, is 199 feet tall. if josh is standing 132 feet from the base of the ride, what is the angle of elevation from the point where josh is standing to the top of the tower?
the angle of elevation from the point where Josh is standing to the top of the Tower of Terror ride is approximately 51.54 degrees.
What is Angle of Elevation?
The angle of elevation is the angle that is formed between the horizontal line and the line of sight. If the line of sight is upward from the horizontal line, then the angle formed is the angle of elevation.
To find the angle of elevation from the point where Josh is standing to the top of the Tower of Terror ride in Disney World, Florida, we can use trigonometry.
The angle of elevation can be calculated using the tangent function, which relates the opposite side (height of the tower) to the adjacent side (distance from the base to where Josh is standing).
Tangent(theta) = Opposite / Adjacent
In this case, the opposite side is the height of the tower (199 feet) and the adjacent side is the distance from the base to where Josh is standing (132 feet).
Tangent(theta) = 199 / 132
To find the angle of elevation (theta), we can take the inverse tangent (arctan) of both sides:
theta = arctan(199 / 132)
Using a calculator, the approximate value of the angle of elevation is:
theta ≈ 51.54 degrees
Therefore, the angle of elevation from the point where Josh is standing to the top of the Tower of Terror ride is approximately 51.54 degrees.
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a forester measured 40 of the trees in a large woods that is up for sale. he found that their mean diameter was 187 inches and their standard deviation 20.4 inches. suppose that these trees provide an accurate description of the whole forest and that the diameter of the tree follows a normal distribution. answer the following: a) what percentage of trees would be below 191 inches in diameter? b) what percentage of trees would be between 176 and 196 inches? c) what size diameter represents the bottom 35% of the trees? d) what size diameter represents the top 35% of the trees?
Approximately 57.83% of trees would be below 191 inches in diameter.
Approximately 37.48% of trees would be between 176 and 196 inches in diameter.
A diameter of approximately 194.83 inches represents the top 35% of the trees.
To find the percentage of trees below 191 inches in diameter, we need to calculate the cumulative probability below that value.
Using the mean and standard deviation given:
Mean (μ) = 187 inches
Standard Deviation (σ) = 20.4 inches
We can standardize the value 191 inches using the z-score formula:
z = (x - μ) / σ
z = (191 - 187) / 20.4 ≈ 0.1961
Next, we find the cumulative probability using the z-score:
P(Z < 0.1961)
Using a standard normal distribution table or calculator, we find that P(Z < 0.1961) ≈ 0.5783.
b) To find the percentage of trees between 176 and 196 inches in diameter, we need to find the cumulative probability between these values.
First, we calculate the z-scores for both values:
z1 = (176 - 187) / 20.4 ≈ -0.5392
z2 = (196 - 187) / 20.4 ≈ 0.4412
Next, we find the cumulative probabilities for each z-score:
P(Z < -0.5392) ≈ 0.2946
P(Z < 0.4412) ≈ 0.6694
To find the probability between these two values, we subtract the smaller probability from the larger probability:
P(-0.5392 < Z < 0.4412) = 0.6694 - 0.2946 ≈ 0.3748
c) To find the diameter that represents the bottom 35% of the trees, we need to find the z-score corresponding to that percentile.
Using a standard normal distribution table or calculator, we find the z-score that corresponds to the bottom 35% is approximately -0.3853.
Next, we can solve for the diameter using the z-score formula:
-0.3853 = (x - 187) / 20.4
Solving for x, we get:
x ≈ 179.17 inches
So, a diameter of approximately 179.17 inches represents the bottom 35% of the trees.
d) To find the diameter that represents the top 35% of the trees, we can use the same approach as in part c) but with the z-score corresponding to the top 35% (which is the same as the bottom 65%).
Using a standard normal distribution table or calculator, we find the z-score that corresponds to the top 35% (bottom 65%) is approximately 0.3853.
Using the z-score formula:
0.3853 = (x - 187) / 20.4
Solving for x, we get:
x ≈ 194.83 inches
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20% of a population of tree frogs are brightly-colored. One hundred of the frogs are sampled randomly; let X represent the number of them that are brightly colored. In which of the following cases would the standard deviation of X be smaller? A)The sampling is without replacement B)The sampling is with replacement C)Not enough information given
The standard deviation of X would be smaller if the sampling is with replacement (option B). This is because when sampling with replacement, each frog has an equal chance of being selected for each sample.
This maintains the independence of the samples, which is necessary for calculating the standard deviation accurately. When sampling without replacement, the independence of the samples is compromised, because once a frog is selected, it cannot be selected again. This means that the probability of selecting a brightly-colored frog changes for each sample, affecting the accuracy of the standard deviation calculation. Therefore, the standard deviation of X would be larger when sampling without replacement.
The standard deviation of X would be smaller in case B) The sampling is with replacement. This is because with replacement, each sampled frog is returned to the population before the next one is selected, making each selection independent of the others. Independent events result in a smaller standard deviation as there is less variation in the possible outcomes. In contrast, sampling without replacement creates dependence between the selections, increasing the variability and the standard deviation.
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