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1. The average on a statistics test was 76 with a standard deviation of 11. If...


1. The average on a statistics test was 76 with a standard deviation of 11. If the test scores are normally distributed, find the probability that the mean score of 36 randomly selected students is between 72 and 81. *
Math   Statistics-And-Probability   
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Answer #1

Refer Standard normal table/Z-table to find the probability OR use excel formula "=NORM.S.DIST(2.7273, TRUE)" & "=NORM.S.DIST(-2.1818, TRUE)" to find the probability.

The probability that the mean score of 36 randomly selected students is between 72 and 81 is

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