z is a standard normal random variable. What is the value of z if the area to the right of z is 0.1213?
A) -1.17
B) 1.17
C) -0.17
D) 0.17

Question

Quizplus · Accepted Answer

Since the area to the right of z is given, we need to find the z-score that corresponds to the area to the left of z, which is 1 - 0.1213 = 0.8787. Using a standard normal table or calculator function, we can find the z-score that corresponds to the area of 0.8787 is approximately 1.17. Since we want the area to the right of z, the answer is the negative of the z-score we just found, which is -1.17. Therefore, the correct answer is B.

Z Is a Standard Normal Random Variable