The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. a)What percent of pregnancies last between 250 and 282 days? b)We know roughly 99.7% of all pregnancies fall between how many days?c) A pregnancy located in the 16th percentile would last how long? d) If 15 women are surveyed, what is the probability that 5 of them have a pregnancy that last between 250 and 266 days? e) If a woman is claiming her pregnancy is lasting longer than 90% of pregnancies, how long might her pregnancy last?

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1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days. a)What percent of pregnancies last between 250 and 282 days? b)We know roughly 99.7% of all pregnancies fall between how many days?c) A pregnancy located in the 16th percentile would last how long? d) If 15 women are surveyed, what is the probability that 5 of them have a pregnancy that last between 250 and 266 days? e) If a woman is claiming her pregnancy is lasting longer than 90% of pregnancies, how long might her pregnancy last?

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