Which of the following proportions is largest in a z distribution?
A) The proportion of area above the mean.
B) The proportion of area between z = +1 and z = -1.
C) The proportion of area greater than z = 1.0.
D) The proportion of area less than z = 0.

Question

Quizplus · Accepted Answer

In a z distribution, which is a normal distribution standardized to have a mean of 0 and a standard deviation of 1, the proportion of area between z = +1 and z = -1 is approximately 68%. This is larger than the proportion of area greater than z = 1.0 (which is about 16%), less than z = 0 (which is 50%), or above the mean (also 50%).

Which of the Following Proportions Is Largest in a Z