1
Pregnancy Distribution
Sample Mean
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 14
days. Suppose that a random sample of 49 pregnant women were obtained and the
average length of pregnancy was recorded as 265 days.
1. Clearly, with detail, and using appropriate labeling notation, sketch the distribution
of the length of human pregnancies by hand.
2. Clearly, with detail, and using appropriate labeling notation, sketch by hand the
distribution of the mean lengths of human pregnancies obtained from random samples
of 49 pregnant women.
