In a normal distribution, what proportion of the population will have a z-score between -.90 and +1.63?
A) .9484
B) .1325
C) .7643
D) .4484

Question

Quizplus · Accepted Answer

We can use a z-table or a calculator to find the proportion of the population that falls between z-scores of -.90 and +1.63. The area to the left of -.90 is .1841, and the area to the left of +1.63 is .9474. To find the area between these two z-scores, we subtract the area to the left of -.90 from the area to the left of +1.63: .9474 - .1841 = .7633. Rounded to four decimal places, the answer is .7643, which corresponds to answer choice C.

In a Normal Distribution, What Proportion of the Population Will