The length of human pregnancies varies normally with a mean of 266 days and a standard deviation of 16 days. What percentage of pregnancies last between 234 and 298 days?

Last updated: 8/14/2022

The length of human pregnancies varies normally with a mean of 266 days and a standard deviation of 16 days. What percentage of pregnancies last between 234 and 298 days? 75% 68% 95% 99.7%