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Need help on how to get the answer. Thanks Problem 9: Suppose random variable X follows...

Need help on how to get the answer. Thanks

Problem 9: Suppose random variable X follows a normal distribution, with a mean of 3 and a standard deviation of 2.

c) What is the approximate 85th percentile of X?

answer：z = 1.04, so x = 3 + 2*1.04 = 5.08

math   Statistics-And-Probability   
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Answer #1

Values are calculated from the normal distribution probability table.

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