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The distribution of scores on a standardized aptitude test is approximately normal with a mean of...

The distribution of scores on a standardized aptitude test is approximately normal with a mean of 500 and a standard deviation of 95 What is the minimum score needed to be in the top 20%

on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer.

Math   Statistics-And-Probability   
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Answer #1

Given that, mean (μ) = 500 and standard deviation = 95

We want to find, the value of x such that, P(X > x) = 0.20

Therefore, the minimum score needed to be in the top 20% is 580

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