The normal distribution is usually not a good approximation

The normal distribution is usually not a good approximation for the distribution of the duration of human pregnancies. In fact, the distribution is usually skewed to the left. Can you think of something that might explain the left skew of the duration of human pregnancies. Discuss. Hint: An induced labour.

Solution

The distribution of duration of human pregnancies being skewed to left implies that though estimated duration has to be of 9 months but more duration are found to be less than than that.

This may ocuur due to various natural reason by the induced labor can be the major cause of less duration of human pregnancies.