Length of gestation for pregnant women. On the basis of data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant U.S. women (Chance, Spring 2001.) Gestation has a mean length of 280 days with a standard deviation of 20 days.
a. Find the probability that the length of gestation is between 275.5 and 276.5 days. (This estimate is the probability that a woman has her baby 4 days earlier than the “average” due date.)
b. Find the probability that the length of gestation is between 258.5 and 259.5 days. (This estimate is the probability that a woman has her baby 21 days earlier than the “average” due date.)
c. Find the probability that the length of gestation is between 254.5 and 255.5 days. (This estimate is the probability that a woman has her baby 25 days earlier than the “average” due date.)
d. The Chance article referenced a newspaper story about three sisters who all gave birth on the same day (March 11,1998). Karralee had her baby 4 days early, Marrianne had her baby 21 days early, and Jennifer had her baby 2a days early. Use the results from parts a-c, to estimate the probability that three women have their babies 4,21, and 25 days early, respectively Assume that the births are independent events.
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