MATHEMATICS MIDDLE SCHOOL

scores on a college entrance examination are normally distributed with a mean of 500 and a standard deviation of 100% of people who write this exam obtain scores between 425 and 575​

Answers

Answer 1
Answer:

We have

\mu = 500

\sigma = 100

425 corresponds to a z of

z_1 = (425 - 500)/(100) = -\frac 3 4

575 corresponds to

z_2 = (575 - 500)/(100) = \frac 3 4

So we want the area of the standard Gaussian between -3/4 and 3/4.  

We look up z in the standard normal table, the one that starts with 0 at z=0 and increases.  That's the integral from 0 to z of the standard Gaussian.

For z=0.75 we get p=0.2734. So the probability, which is the integral from -3/4 to 3/4, is double that, 0.5468.

Answer: 55%

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Answers

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Answers

1 yard = 3 feet
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Answer: $156
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Answers

Surface area of a right prism can be calculated using this formula:
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Answers

Answer:

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Step-by-step explanation:

Answer:

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Step-by-step explanation:

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Answers

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