The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 266 days and a standard deviation of 16 days.
a. What proportion of all pregnancies will last between 240 and 270 days (roughly between 8 and 9 months)?
b. What length of time marks the longest 30% of all pregnancies?
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with a mean of 266 and a standard deviation of 16, we would expect 95% of the data to lie between 266 ± 2(16) days. So, 95% of all pregnancies will last between 234 and 298 days
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