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Rzqust [24]
3 years ago
15

Suppose the scores on an exam are normally distributed with a mean μ = 75 points, and standard deviation σ = 8 points. Suppose t

hat the top 4% of the exams will be given an A+. In order to be given an A+, an exam must earn at least what score?
Mathematics
1 answer:
alexandr402 [8]3 years ago
6 0

Answer:

89.008

Step-by-step explanation:

z = (x– mean)/ standard deviation

x = z * standard deviation + mean

Now, z value for the top 4% of the exams (which is the same as getting a score below the 96%) has to be found using a z table.

In this case z = 1.751

x = 1.751 * 8 + 75

x = 89.008

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9d - 5 = 4d + 35<br> find what d equals.
Debora [2.8K]
9d - 5 = 4d + 35

9d (-4d) - 5 (+5) = 4d (-4d) + 35 (+5)

5d = 40

5d/5 = 40/5

d = 8

hope this helps
3 0
3 years ago
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Find an equation that models the path of a satellite if its path is a hyperbola, a = 55,000 km, and c= 81,000 km. Assume the cen
elena-14-01-66 [18.8K]

Answer:

\frac{x^2}{55000^2} - \frac{y^2}{59464^2} =1

Step-by-step explanation:

the transverse axis is horizontal.

so its a horizontal hyperbola

Center is the origin so center is (0,0)

Equation of horizontal hyperbola is

\frac{x^2}{a^2} - \frac{y^2}{b^2} =1

Given a= 55000 and c= 81000

c^2 = a^2 + b^2

81000^2 = 55000^2 + b^2

subtract 55000^2 on both sides

b  = sqrt(81000^2 - 55000^2)= 59464.27

now plug in the values

\frac{x^2}{55000^2} - \frac{y^2}{59464^2} =1

7 0
3 years ago
Which explains why the graph is not a function?
german

The statements that apply to the ratio of rice and water are:

  • The ratio of rice to water is 1 to 2.5
  • The ratio of water to rice is 2.5 to 1

<h3>Ratios</h3>

Ratios are used to compare quantities of different measurements

The entries on the table are given as:

<u>Rice          Water</u>

2                  5

3                  7.5

5                 12.5

8                 20

<h3>The ratios of both quantities</h3>

The ratio (r) of rice and water is then calculated as:

r = \frac{Water}{Rice}

Pick any corresponding table entry.

So, we have:

r = \frac{5}{2}

Divide

r = 2.5

This means that, the ratio of rice to water is 1 to 2.5, and the ratio of water to rice is 2.5 to 1

Read more about ratios at:

brainly.com/question/1781657

3 0
2 years ago
Simplify the expression 7(3+2p+7).
ipn [44]

Answer: 14p +70

Step-by-step explanation:

6 0
3 years ago
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What is the polynomial 3y2 + (y + 7)2 – 15 after it has been fully simplified and written in standard form?
Greeley [361]

Answer:

4y^2 + 14y + 34

I hope this helps :)

4 0
3 years ago
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