Question

If z is a standard normal random variable,what is the area between z = -1.20 and z = 1.40?

Answer 1

.8041

Explanation:

All we need to do is find the corresponding areas for our z-scores in the table.

Using the table below (this variant of which is from chegg.com), we can see that
the area of the curve to the left of `z = -1.20` is `.1151`
and the area of the curve to the left of `z = 1.40` is `.9192`

To find the area between two z-scores, we subtract the smaller one from the larger one:

`.9192 - .1151 = .8041`

to come up with our answer.