Solved: The time needed to complete a test has been found to be, Basic Statistics

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The time needed to complete a test has been found to be

The time needed to complete a test has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 10 minutes. (NOTE: you must first define a random variable .)

(a) If the probability of completing the test in T minutes or less is 0.8, find T

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Basic Statistics: The time needed to complete a test has been found to be

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