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Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US
Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US women (Chance, Spring, 2001). Gestation length has a mean of 280 days with a standard deviation of 20 days. 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 25 days early. Use the results, parts a - c to estimate the probability that all three women have their babies 4, 21, 25 days early, respectively. Assume the births are independent events. Results a) .02 B) 0.011 c)0.009
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