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Given a normal population whose mean is 680 and whose standard deviation is 48, find each...

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Statistics

Given a normal population whose mean is 680 and whose standarddeviation is 48, find each of the following (use Excel to obtainmore accuracy):

A. The probability that a random sample of 3 has a mean between687 and 699.

Probability =

B. The probability that a random sample of 18 has a mean between687 and 699.

Probability =

C. The probability that a random sample of 27 has a mean between687 and 699.

Probability =

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