The length of human pregnancies from conception to birth varies according to a distribution that is
Question: 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 240 days (about 8 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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