11.39 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 less than 270 days (about 9 months)? b) What percent of pregnancies last between 240 and 270 days (roughly between 8 and 9 months)? c) How long do the longest 20% of pregnancies last?

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