Given a normal population whose mean is 50 and whose standard deviation is 5, find the probability

Question:

Given a normal population whose mean is 50 and whose standard deviation is 5, find the probability that a random sample of

a. 4 has a mean between 49 and 52.

b. 16 has a mean between 49 and 52.

c. 25 has a mean between 49 and 52.

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