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19-09-2022
Mathematics

Answered

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) At what percentile is a pregnancy that lasts 240 days
(that’s about 8 months)?
(b) What percent of pregnancies last between 240
and 270 days (roughly between 8 months and
9 months)?
(c) How long do the longest 20% of pregnancies last?

Answer :

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