If the Stanford-Binet IQ test is normally distributed with a mean of 100 and a standard deviation of 20, what percent of the population has an IQ between 90 and 110?

Given:

Side length of a square base = 15.9 cm

Height of square base pyramid = 13.8 cm

To find:

The volume of the square base pyramid.

Solution:

The area of square base is

Now, the volume of a the square base pyramid is:

Where, B is the base area and h is the height.

Putting and , we get

Therefore, the volume of the pyramid is 1162.9 cubic cm.