If Z is a standard normal random variable, the area between z = 0.0 and z = 1.30 is 0.4032, while the area between z = 0.0 and z = 1.50 is 0.4332. What is the area between z = -1.30 and z = 1.50?
A) 0.0300
B) 0.0668
C) 0.0968
D) 0.8364
E) 0.1428

Question

Quizplus · Accepted Answer

The area between z = -1.30 and z = 1.50 is the sum of the area from z = 0 to z = 1.30 and the area from z = 0 to z = 1.50, because the standard normal distribution is symmetric about z = 0. Therefore, the total area is 0.4032 (from 0 to 1.30) + 0.4332 (from 0 to 1.50) = 0.8364.

If Z Is a Standard Normal Random Variable, the Area