Question: Length of pregnancies
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 fewer than 240 days (that's 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 25% of pregnancies last?