The scores on a psychology exam were normally distributed with a mean of 52 and a...

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Question

The scores on a psychology exam were normally distributed with a mean of 52 and a standard deviation of 9.

About what percentage of scores were less than 25%

The percentage of scores that were less than 25%. ____

math Statistics-And-Probability

Answer 1

Answer #1

Given that,

P(Z < -0.674) = 0.25

z = -0.674

Using z-score formula,

x = z * +

x = -0.674 * 9 + 52 = 47.284

Score = 47.284

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Answer 2

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