Did I Get This – Using the Standard Deviation Rule

Published: February 8th, 2013

Category: Activity 2: Did I Get This?

Length (in days) of human pregnancies is a normal random variable (X) with mean 266, standard deviation 16.

For the questions below, it would be useful to sketch this normal distribution yourself, marking its mean and the values that are 1, 2, and 3 standard deviations below and above the mean.

Compare your figure to ours.

This document is linked from Normal Random Variables.