that M= 2 2 1 +6 2 -X 2 1 3 find X, for M to be singular

Answers

Answer 1

X must be equal to 0 for M to be singular.

For M to be singular, its determinant must be zero. So, we can set up the equation:

| 2 2 1 |

| 6 2 -x |

| 2 1 3 | = 0

Expanding the determinant along the first row, we get:

2 | 2 -x |

-6 | 1 3 | = 0

Multiplying the determinant of the 2x2 matrix by 2, we get:

4(-x - 3) - (-6)(2) = 0

Simplifying the left-hand side, we get:

-4x - 12 + 12 = 0

Solving for x, we get:

-4x = 0

x = 0

Therefore, X must be equal to 0 for M to be singular.

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Related Questions

Question 1
Find the volume of the prism, Round your answer to the nearest tenth, if necessary.
13 m
3m
5m
Need help with this question?

Answers

The volume of the prism is 195 cubic meters.

To find the volume of the prism, we need to multiply the length, width, and height of the prism.

Length = 13 m

Width = 3 m

Height = 5 m

Volume = Length x Width x Height

Volume = 13 m x 3 m x 5 m

Volume = 195 cubic meters

Solids Applied Problem
Find the volume of 1 coin from the stack below. Each coin has a radius of 0.5 in and the coins
are offset by 1 in. The slant is 7in long. Show your work.


Answers

The amount of volume of 1 coin in the stack underneath is 0.433 cm³. The distance between the coins is 1 in, and each coin having a radius approximately 0.5 in. 7 inches make up the tilt.

Any three-dimensional solid's volume is the area it takes up. The volume of these solids include cubes, cuboids, cones, cylinders, and spheres. Different shapes have different volumes. We have looked at a variety of three-dimensional solids and shapes, including cubes, cuboids, cylindrical objects, cones, and and more.

V= πD²×h/4

  =π0.5²×7/4

   = 0.433 cm³

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identify all the situations that depict inverse variation.

Answers

Inverse variation is a relationship between two variables where one variable increases as the other variable decreases, and vice versa.

This means that as one variable doubles, the other variable will decrease by half, or vice versa.

The following are situations that depict inverse variation:

1. When you are traveling at a constant speed, the time it takes to cover a given distance is inversely proportional to the distance. This is because the distance will decrease as the speed increases.

2. If you have a light source, the intensity of the light decreases as you move further away from the source. This is because the distance between the source and the object increases as the intensity of the light decreases.

3. The force of gravity between two objects is inversely proportional to the square of the distance between them. This is because the force of gravity will decrease as the distance between the objects increases.

4. When the temperature of a gas decreases, its pressure increases. This is because the volume of the gas remains constant as the temperature decreases, which causes the pressure to increase according to the gas laws.

5. The period of a pendulum is inversely proportional to the square root of its length. This is because the length of the pendulum will decrease as the period increases.

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1.what is the cost of three 5kg bags of Rice at ¢2 par kg.

2.how many 2km price can I cut off a string of one meter long.

3. what fraction of a litre is 259 ml?

4.write 60ps as a decimal of ¢240.

5. how many groups of 4 mark 20.

6.an orange ¢150 .how much do 9 orange coast.

7. find the product of 35 and 12 .

8.how many 180g could be obtained from kg?​

Answers

1. Using mathematical operations, the cost of three 5kg bags of rice at ¢2 per kg is ¢30.

2. From the 2km piece, you can cut 2,000 pieces with each one meter long.

3. The fraction of a liter that is 259 ml can be written as ²⁵⁹/₁₀₀₀.

4. 60ps expressed as a decimal of ¢240 is 0.25.

5. The groups of 4 marks in 20, based on a division operation, is 5.

6. If an orange costs ¢150, by multiplication, 9 oranges will cost ¢1,350.

7. The product of 35 and 12, which is a multiplication operation, is 420.

8. Using division operation, from 1 kg, one could obtain 5.55 units of 180g each.

What are mathematical operations?

The four basic mathematical operations are addition, subtraction, division, and multiplication.

In this situation, the mathematical operations involved are division and multiplication.

1) The cost of price per kg = ¢2

The number of bags bought = 3

The weight per bag = 5kg

The total weight of 3 bags = 15kg (5 x 3)

The total cost = ¢30 (¢2 x 15)

2) The total length of the piece = 2km

1 km = 1,000 meters

2km = 2,000 meters

The length of each string = 1 meter

The number of strings = 2,000 (2,000 ÷ 1)

3) 1 liter = 1,000 ml

259 ml/1,000 ml = 259/1,000

= ²⁵⁹/₁₀₀₀

4) 60p as a decimal of ¢240

= 0.25 (60 ÷ 240)

5) 20 ÷ 4 = 5

4 x 5 = 20

6) The cost per orange =  ¢150

The number of oranges bought = 9

The total cost of 9 oranges = ¢1,350 (¢150 x 9)

7) The product of 35 and 12 = 420 (35 x 12)

8) The quantity of each unit = 180g

The total quantity = 1 kg

1 kg = 1,000 g

5.55 (1,000 ÷ 180)

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Perform the indicated operation:
(4 + 2i) (1 + 5i)
-6 +22i
6-221
-14 + 18i
6+22i

Answers

Answer:

-235+84i

Step-by-step explanation:

I hope this is what you were looking for.

100 POINTS

Dave wants to rent a two-bedroom apartment in City Fields. The apartment has a monthly rent of D dollars. The fees he has been quoted are shown below. Write an algebraic expression that represents the amount he is expected to pay before renting the apartment.

Answers

Answer:

Final Expression:

3.095D + $10

Step-by-step explanation:

Let's represent the Monthly Rent by "D" dollars

The amount Dave is expected to pay before renting the apartment is the Sum of All the Fees he has been quoted:

Application Fee:

1.5% of 1 month's rent = 0.015D

Credit Application Fee:

$10.00

Security Deposit:

1 Month's rent =  D

Last Month's rent:

1 Month's Rent = D

Broker's Fee:

9%

Thus, The algebraic expression that represents the amount Dave is expected to pay before renting the apartment is:

0.015D + $10  +  D  +  D + 1.08D

Simplify Expression:

3.095D  + $10

Hence, The final expression is:

Answer:  3.095D + $10

help!!!

Drag the tiles to the boxes to form correct pairs. Not all tiles will be used.
Determine each segment length in right triangle ABC

Answers

According to the figure the required lengths are

BD = 7 units

BC = 9.9 units

How to find the required lengths

The required lengths is solved knowing that in a right triangle having angle 45 degrees, the lengths of the legs of the right triangle are equal.

Also,  the perpendicular bisector creates another angle 45 degrees at angle B.

hence we another right triangle with a leg as 7 units hence BD is 7 units

solving for BC

BC = BA

BC² + BA² = CA²

BC² + BC² = 14²

2 x BC² = 196

BC² = 98

BC = √(98)

BC = 9.9 units

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sphere a has a radius of r feet. sphere b has a radius of 2r feet. sphere c has a radius of 3r feet. write the appropriate values to complete the statements.

The volume of Sphere A is __ the volume of Sphere B.
The volume of Sphere C is __ times the volume of Sphere A.

1/27 1/9 1/8 1/4 2 8 9 27

Answers

Answer: 3r

Step-by-step explanation: because 2r+1r=3r

The volume of Sphere A is the volume of Sphere B when the radius of Sphere B is 2r. Therefore, the volume of Sphere A is:

V(A) = (4/3) * pi * r^3

And the volume of Sphere B is:

V(B) = (4/3) * pi * (2r)^3 = (4/3) * pi * 8r^3 = (32/3) * pi * r^3

To complete the statement "The volume of Sphere A is the volume of Sphere B," we need to set these two volumes equal to each other and solve for r:

(4/3) * pi * r^3 = (32/3) * pi * r^3
r^3 = (32/4) * r^3
r^3 = 8r^3
1 = 8
This equation is not true, so the statement "The volume of Sphere A is the volume of Sphere B" is false.

The volume of Sphere C is times the volume of Sphere A when the radius of Sphere C is 3r. Therefore, the volume of Sphere C is:

V(C) = (4/3) * pi * (3r)^3 = 36 * pi * r^3

To complete the statement "The volume of Sphere C is times the volume of Sphere A," we need to divide the volume of Sphere C by the volume of Sphere A and simplify:

V(C) / V(A) = (36 * pi * r^3) / [(4/3) * pi * r^3] = 27

Therefore, the correct value to complete the statement is 27.

what is the radius of the circle shown below x^2+y^2-8x-10y-8=0

Answers

Answer:

r = 7

Step-by-step explanation:

equation of circle is (x - a)² + (y - b)² = r²

where a is x-coordinate of centre of circle, b is y-coordinate of centre of circle, r is the radius. radius = half of diameter.

x² - 8x + y² - 10y = 8

we need to complete the sqaure for both x and y

x² - 8x = (x - 4)² = x² - 8x + 16, which is 16 more than x² - 8x. so we need to subtract that 16.

we now have (x - 4)² - 16.

now do the same with y

(y - 5)² = y² - 10y + 25, which is 25 more than y² - 10y. so we need to subtract 25.

we now have (y - 5)² - 25.

back to our full equation.

(x - 4)² -16 + (y - 5)² - 25 = 8

(x - 4)² + (y - 5)² - 41 = 8

(x - 4)² + (y + 5)² = 49 = r²

radius r = √49 = 7

Enter a positive value for n that makes this statement true: 1 x n is greater than 1 but less than 2

Answers

A positive value for n that makes the statement true is n = 1.5.

We need to find a positive value for n that satisfies the given inequality: 1 < 1 x n < 2.
Step 1: Choose a value of n such that it's greater than 1 when multiplied by 1.
Step 2: Ensure the chosen value also makes the product less than 2 when multiplied by 1.
Let's try n = 1.5:
1 x 1.5 = 1.5
Now, let's check if it satisfies the inequality:
1 < 1.5 < 2
Yes, it does. So, a positive value for n that makes the statement true is n = 1.5.

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write the equation of a line that is perpendicular to x=8 and that passes through the point (-3,-2)​

Answers

Answer:

y = - 2

----------------

The line that is perpendicular to x = 8 has a form of:

y = a

Since it has a point (-3, - 2), the value of a is the y-coordinate of this point. Therefore the line is:

y = - 2

can someone help me with this?

Answers

Answer: 27[tex]\pi[/tex]

Step-by-step explanation:

Use the circle area formula: r²[tex]\pi[/tex]...

6²[tex]\pi[/tex] = 36[tex]\pi[/tex]

And since a quarter of the circle is removed(aka [tex]\frac{1}{4}[/tex]), divide 36 by [tex]\frac{3}{4}[/tex]...

= 27[tex]\pi[/tex]

In a sample of 10 students, 7 said No to there being a difference in taste between Coke and Pepsi while 3 says Yes. What is the probably 95% agree that there is no difference in taste between coke and Pepsi?

Answers

We cannot conclude that 95% of the population agrees that there is no difference in Taste between Coke and Pepsi.

To calculate the probability that 95% of the population agrees that there is no difference in taste between Coke and Pepsi, we can use the binomial distribution formula.

Let X be the number of students who say there is no difference in taste, and n be the total number of students in the sample. Then, X follows a binomial distribution with parameters n and p, where p is the true proportion of students who say there is no difference in taste.

The point estimate of p is 7/10 = 0.7. The standard error of the proportion can be calculated as the square root of p(1-p)/n = sqrt(0.7*0.3/10) = 0.23.

Using a normal approximation to the binomial distribution, the 95% confidence interval for p is given by:

0.7 +/- 1.96*0.23 = (0.24, 1.16)

Since the interval includes 0.5, which represents the point where the proportion of agreement and disagreement is equal, we cannot conclude that 95% of the population agrees that there is no difference in taste between Coke and Pepsi.

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Tanya has captured many purple-footed bog frogs. She weighs each one and
then counts the number of yellow spots on its back. This trend line is a. fit for these data.
O A weak
B. strong
C. parabolic
D. negative

Answers

Answer:

B) strong

Step-by-step explanation:

The correlation coefficient is close to 1, meaning it is both a strong correlation and a positive correlation.

find the median of each of the following scores
x f fc
300-309 9 9
310-319 20 29
320-329 24 53
330-339 38 91
340-349 48 139
350-359 27 166
160-169 17 183
170-179 6 189

Answers

The median score, considering the frequency distribution in this problem, is given as follows:

334.5.

How to obtain the median of a data-set?

The median of a data-set is the middle value of a data-set, the value of which 50% of the measures are less than and 50% of the measures are greater than. Hence, the median also represents the 50th percentile of a data-set.

The total number of observations in the data-set is given as follows:

189.

Hence the position in the cumulative frequency table of the median element is given as follows:

0.5 x (189 + 1) = 95.

Which is in the following interval:

330-339.

Hence the median is of 334.5, as it is the middle value of the interval.

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On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite
direction. The number b varies directly with the number a. For example b = 22 when a = - -2 Which equation
represents this direct variation between a and b?

Answers

The equation that represents the direct variation between a and b in the given problem is: b = -a. So, option is correct.

The statement "a number, b, is located the same distance from 0 as another number, a, but in the opposite direction" means that b = -a. The statement "The number b varies directly with the number a" means that b is proportional to a, or mathematically, b = k*a, where k is the constant of proportionality.

Substituting b = -a into the equation b = ka, we get -a = ka. Solving for k, we get k = -1. Therefore, the equation that represents the direct variation between a and b is b = -a which is option B, "-b = -a".

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Complete question - On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite direction. The number b varies directly with the number a. For example b = 22 when a =  -2 Which equation represents this direct variation between a and b?

A. a = -1

B. -b = -a

C. b-a = 0

D. b(-a) = 0.

#11) Determine the period of the following trigonometric function y =
a) 360 b) 180°
c) 360
c) 120
d) 60*

Answers

The solution is: the period for the graph of y = cos (0) is:

c.360

We have the following equation:

y = cos (0)

The first thing you should know is that the period of a function is that value for which the function repeats itself.

We have then:

y = cos (0) = 1

y = cos (360) = 1

Therefore, the period is 360.

Answer:

the period for the graph of y = cos (0) is:

c.360

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complete question:

What is the period for the graph of y=cos(0)? (Sketch a graph to help determine the answer.)

a.180

b.90

c.360

d.270

How many multiples of both 2 and 5 are there in between 34 and 417?

Answers

The number of multiples of both 2 and 5 that are there between 34 and 417 is given as follows:

39.

How to obtain the multiples?

The rules for the multiples of 2 and 5 are given as follows:

Multiples of 2: numbers finished in 0, 2, 4, 6, 8.Multiples of 5: numbers finished in 0 and 5.

Hence the numbers that are multiples of both 2 and 5 finish in zero, which are the multiples of 10.

Then the divisions are given as follows:

417/10 = 41. -> integer part.34/10 = 3 -> integer part.

Hence the number of multiples is given as follows:

41 - 3 + 1 = 39.

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construction worker cuts a pace of electrical wires that is 7/8 of an inch in the length heat and cuts and other piece that is 5/8 of an inch in length what is the combined length of the pieces of wire

Answers

The combined length of the two pieces of wire is 3/2 inches or 1 and 1/2 inches.

To find the combined length of the pieces of wire, we need to add the lengths of the two pieces of wire together.

The first piece of wire is 7/8 of an inch long.

The second piece of wire is 5/8 of an inch long.

To add the two fractions, we need to find a common denominator. The smallest number that both 8 and 5 will divide into is 40.

7/8 can be rewritten as 35/40 (multiply the numerator and denominator by 5)

5/8 can be rewritten as 25/40 (multiply the numerator and denominator by 5)

Now we can add the two fractions:

35/40 + 25/40 = 60/40

Simplifying the fraction:

60/40 = 3/2

Therefore, the combined length of the two pieces of wire is 3/2 inches or 1 and 1/2 inches.

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A basketball has an approximate volume of 268 cm³. What is the diameter of the basketball? Use 3.14 for π, and round your answer to the nearest whole centimeter.

Answers

The diameter of the basketball is 16 cm given the volume of 268 [tex]cm^{3}[/tex]

What is Sphere?

Sphere is a three-dimensional object that is round in shape. It  is an object that is completely round in shape like a ball.

How to determine this

When a basketball has a volume of 268[tex]cm^{3}[/tex]

The volume of a sphere = 4/3 * π * [tex]r^{3}[/tex]

Where π = 3.14

Radius, r = ?

Volume of basketball = 4/3 * 3.14 * [tex]r^{3}[/tex]

268[tex]cm^{3}[/tex] = 4/3 * 3.14 * [tex]r^{3}[/tex]

268[tex]cm^{3}[/tex] = 12.56/3 * [tex]r^{3}[/tex]

Cross multiply

268 * 3 = 12.56 * [tex]r^{3}[/tex]

804 = 12.56 * [tex]r^{3}[/tex]

divides through by 12.56

804/12.56 = 12.56[tex]r^{3}[/tex]/12.56

64.01 = [tex]r^{3}[/tex]

cube both sides

∛64.01 = r

r = 4 cm

So, the radius = 4 cm

To find the diameter of basketball

When the radius = 4 cm

And diameter = 2(r)

Diameter = 2 * 4 cm

Diameter = 8 cm

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Srekar needs to increase the length, width, and height of the prism below by 2 inches. The original prism has a length of 3 inches, a width of 2 inches, and a height of 1 inch. A prism has a length of 3, height of 1, and width of 2. Which statements about the new prism are true? Select three correct answers. The new prism will have a length of 5 because 3 + 2 = 5. The new prism will have a width of 4 because 2 + 2 = 4. The new prism will have a height of 2 because 1 times 2 = 2. The volume will increase by 6 because 2 times 3 = 6 and each of the 3 dimensions is increased by 2. Srekar could increase the volume by the same amount by just adding 6 to the height instead of 2 to each side. The volume of the new prism will be 20 times 3 = 60 because there will be 20 cubes in each layer and the height will be 3 so there will be 3 layers of 20 cubes each.

Answers

The three accurate statements concerning the new prism are as follows:

The new prism will possess a length of 5, which can be derived from the addition of 3 and 2 resulting in 5.The new prism will possess a width of 4, obtained by adding 2 and 2, yielding 4.

The volume will experience a growth of 6 units, as each of the three dimensions is increased by 2.

This can be calculated by multiplying 2 by 3, resulting in an increase of 6.

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Determine whether each pair of polygons is similar. If so, write a
similarity statement.

Answers

Answer:

The polygons are similar. They are similar in the way that the larger polygon is 3 times the size of the smaller one.

An expression with three missing parts is shown. Write a whole number from 1 to 9 in each box
to create the expression with the greatest value when a = 5. Each whole number can only be
used once.
a+
1 2 3 4 5 6 7 8 9

Answers

The expression with the greatest value when a = 5 is:

a + 9 × 8 ÷ 7, with 9 in the first box, 8 in the second box, and 7 in the third box.

To create the expression with the greatest value when a = 5, we want to choose the largest possible numbers to fill in the missing parts.

Since each whole number can only be used once, we should choose the three largest numbers from 1 to 9.

The three largest numbers from 1 to 9 are 9, 8, and 7. So we can fill in the expression as follows:

a + 9 × 8 ÷ 7

When a = 5, this expression evaluates to:

5 + 9 × 8 ÷ 7 = 5 + 72 ÷ 7 = 15.2857...

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For f(x) = √(x+4) , what is the value of the function when x = 8 ? Round to the nearest hundredth.
NEED ANSWER ASAP!!​

Answers

Answer:

exact form : 2√3

decimal form : 3.46410161… or 3.46

hope this helps you!

Answer:

The value of the function is [tex]\sqrt{12}[/tex]. Rounded to the nearest hundredth, the answer is 3.46

Step-by-step explanation:

We are given the value of x, so we simply have to evaluate the function:

[tex]f(x)=\sqrt{x+4}[/tex]

Substitute 8

[tex]f(8)=\sqrt{8+4}[/tex]

Add in the radical

[tex]\sqrt{12}[/tex]

The value of the function is sqrt(12).

Rounded to the nearest hundredth: [tex]3.46[/tex]

Analyze the pre-image ABCD. What are the vertices of the final image if T-1, -2 ° Ty = › is applied to figure ABCD?

Answers

Answer:

A''(3, 0); B''(3, 2); C''(1, 1); D''(1, -1)

Step-by-step explanation:

Joe wondered whether the days of the week of health clinic appointments at his clinic had an even distribution from Monday through Friday, so he took a random sample of
500
500500 health clinic appointments and recorded their days of the week. Here are his results:
Day Monday Tuesday Wednesday Thursday Friday
Appointments
115
115115
100
100100
115
115115
100
100100
70
7070
He wants to use these results to carry out a

2
χ
2
\chi, squared goodness-of-fit test to determine if the distribution of days of the week of the appointments disagrees with an even distribution.
What are the values of the test statistic and P-value for Joe's test?

Answers

The test statistic is 14.5 and the P-value is less than 0.05. Therefore, we have evidence to suggest that the distribution of days of the week of the appointments disagrees with an Even distribution.

To carry out the chi-squared goodness-of-fit test, we need to calculate the expected number of appointments for each day if there were an even distribution. Since there are 5 days of the week, each day would have an expected value of 100 (i.e., 500 appointments / 5 days = 100 appointments per day).

Day | Monday | Tuesday | Wednesday | Thursday | Friday

Observed | 115 | 100 | 115 | 100 | 70

Expected | 100 | 100 | 100 | 100 | 100

To calculate the chi-squared test statistic, we use the formula:

χ2= ∑ (observed − expected)^2 / expected

Plugging in the observed and expected values, we get:

χ2= [(115 - 100)^2/100] + [(100 - 100)^2/100] + [(115 - 100)^2/100] + [(100 - 100)^2/100] + [(70 - 100)^2/100]

  = 2.75 + 0 + 2.75 + 0 + 9

  = 14.5

To find the P-value, we need to use the chi-squared distribution table with 4 degrees of freedom (5 days of the week minus 1 for the expected value). Using the table, we find that the P-value for a chi-squared statistic of 14.5 with 4 degrees of freedom is less than 0.05. Therefore, we reject the null hypothesis that the appointments have an even distribution from Monday through Friday.the test statistic is 14.5 and the P-value is less than 0.05. Therefore, we have evidence to suggest that the distribution of days of the week of the appointments disagrees with an even distribution.

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The position of a particle on the x-axis at time t, t >0, is ln(t). The average velocity of the particle for 1 <= t <= e is.
A. (1/e) - 1
B. 1/(e - 1)
C. e
D. e - 1
Please show work

Answers

Answer:

Perdón no te puedo ayudar no entiendo

Step-by-step explanation:

To find the average velocity of the particle over the interval [1, e], we need to calculate the net displacement divided by the time interval.

Given the position function x(t) = ln(t), let's find the displacement by evaluating x(e) and x(1):

x(e) = ln(e) = 1

x(1) = ln(1) = 0

So, the net displacement is 1 - 0 = 1.

The time interval is e - 1.

Therefore, the average velocity is:

average velocity = (net displacement) / (time interval)

average velocity = 1 / (e - 1)

The correct answer is B. 1/(e - 1).

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Using the empirical rule, what percentage of people have an IQ score between 55 and 145?

Answers

Approximately 99.4% of people have an IQ score between 55 and 145.

The empirical rule, also known as the 68-95-99.7 rule, is a statistical rule that applies to data that is normally distributed. It states that:

- Approximately 68% of data falls within one standard deviation of the mean.

- Approximately 95% of data falls within two standard deviations of the mean.

- Approximately 99.7% of data falls within three standard deviations of the mean.

In this case, we are given that IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. To find the percentage of people with an IQ score between 55 and 145, we need to find the number of standard deviations away from the mean that these scores are.

For an IQ score of 55, we have:

z = (55 - 100) / 15 = -3

For an IQ score of 145, we have:

z = (145 - 100) / 15 = 3

So, we can see that an IQ score of 55 is 3 standard deviations below the mean, and an IQ score of 145 is 3 standard deviations above the mean.

According to the empirical rule, approximately 99.7% of data falls within three standard deviations of the mean. Therefore, the percentage of people with an IQ score between 55 and 145 is approximately:

99.7% - (0.15% + 0.15%) = 99.4%

(Note that we subtracted the percentage of data that falls more than 3 standard deviations away from the mean, which is approximately 0.15% on either side.)

So, approximately 99.4% of people have an IQ score between 55 and 145.

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6th grade of a school with a total of 90 students. In the year-end summary, the number of good students is equal to 1/6 of the students in the whole grade, the number of good students is equal to 40 of the students in the whole block, the average number of students is equal to 1/3 of the number of students in the whole grade. is the weak student again, calculate the number of students in each category

Answers

There are a total of 15 good students, 35 weak and 40 in bad shape if number of good students are fraction of 1/6th of total students.

As we know that the total number of students are 90.

Good students are fraction of 1/6th of total students.

Good students= 1/6x90

Good students=15

There are 40 good students in a whole block, so X = 40.

In the whole grade, average number of students is 1/3 of students in whole grade.

Students in each class = 1/3x90

Students in each class = 30

Students who are not good in economics and government = 90-40

Students who are not good in economics and government = 50

As the total number of students is sum of good students and weak students.

15+Weak students =90-40

15+Weak students=50

Weak students=50-15

Weak students=35    

So, total of 15 good students, 35 weak and 40 in bad shape.

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Select the system of linear inequalities whose solution is graphed. O y < 3x-2, x + 2y > 4 O y ≤ 3x-2, x + 2y 2 4 O y> 3x-2, x + 2y < 4 O y2 3x-2, x + 2y ≤ 4​

Answers

Option D is the correct answer.

From the graph, we can conclude that,

1. The two lines are continuous lines and not broken lines. So, the inequality sign should be either ≤ or ≥.

2. The points on the lines of the shaded region are also included in the solution.

The only option that matches with the above conditions is option D. So, option D is the correct answer.

Let us verify it.

Now, let us consider a point that is inside the shaded region and also on any one line.

Let us take (0, 2).

Plug in 0 for x and 2 for y in each of the options and check which inequality holds true.

Considering the inequalities,

y ≥ 3x - 2

x + 2y ≤ 4

Solving we get,

2 ≥ 3(0) - 2

2 ≥ -2

x + 2y ≤ 4

0 + 2(2) ≤ 4

4 ≤ 4

Here, both inequalities are correct.

So, option D is the correct answer.

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The complete question is =

Which system of linear inequalities is graphed?

A. y < 3x-2

x + 2y ≥ 4

B. y < 3x - 2

x + 2y > 4

C. y > 3x - 2

x + 2y < 4

D. y ≥ 3x - 2

x + 2y ≤ 4

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