Use the normal distribution in Exercise 15.

(a) What percent of the new mothers had a pregnancy length of less than 290 days?

(b) What percent of the new mothers had a pregnancy length of between 260 and 300 days?

(c) Out of 250 randomly selected new mothers, about how many would you expect to have had a pregnancy length of greater than 287 days?

Exercise 15

A member is selected at random from the population represented by the graph. Find the probability that the member selected at random is from the shaded region of the graph. Assume the variable x is normally distributed.

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Pregnancy Length in a Population of New Mothers 285