Mathematics, 29.04.2021 15:40 Lukeadams

The length of a human pregnancy follows a Normal distribution with a mean of 266 days and a standard deviation of 16 days a. Find the probability that a randomly selected woman will have a pregnancy of less than 258 days.
b. Find the mean and new standard deviation of the sampling distribution of the mean length of pregnancy for an SRS of 80 women.
(Note: I already know part a, I just can't get the right standard deviation for part b)

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