For the next two questions assume that X = Length of
Pregnancy has a normal distribution with a mean of μX = 268 days and a standard deviation of σX = 15 days.
a) What is
the probability that a single woman will have a pregnancy that is less
than 260 days?
What is the Prob( Xi
< 260 ) ?
b) What is
the probability that the average length of pregnancy in a group of n=25
women will be less than 260 days? What is the Prob(x̄ < 260)
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