Area Under the Standard Normal Curve

Question

Find the area under the standard normal curve between the given z-values.

z1 = -1.25 z2 = 2.16

Answer 1

You need to look up these probabilities in the normal distribution table.

You can google "normal distribution table"

Optionally, you can use the MS Excel function =normdist(2.16,0,1,true)-normdist(-1.25,0,1,true)

the result is

Answer 2

That's correct, Patrick. And, so that is just adding the probability of each of the 2 Z--scores (i.e., values) together.