If z is a standard normal random variable, the area between z = 0.0 and z = 1.20 is 0.3849, while the area between z = 0.0 and z = 1.40 is 0.4192. What is the area between z = -1.20 and z = 1.40?
A) 0.0808
B) 0.1151
C) 0.0343
D) 0.8041
E) 0.1646

Question

Quizplus · Accepted Answer

To find the area between z = -1.20 and z = 1.40, we can subtract the area to the left of z = -1.20 from the area to the left of z = 1.40.

The area to the left of z = -1.20 is the same as the area to the right of z = 1.20, which is 1 - 0.3849 = 0.6151.

Therefore, the area between z = -1.20 and z = 1.40 is 0.4192 - 0.6151 = 0.8041.

So the answer is D.

If Z Is a Standard Normal Random Variable, the Area