To find proportion of the area under the normal curve between two Z scores,one below the mean and the other above the mean,it is necessary to examine the
A)sum of the areas between each Z score and the mean.
B)difference of the areas between each Z score and the mean.
C)sum of the areas beyond each Z score and the mean.
D)difference of the areas beyond each Z score and the mean.

Question

Quizplus · Accepted Answer

The proportion of the area under the normal curve between two Z scores, one below the mean and the other above the mean, is found by adding the areas from each Z score to the mean. This is because the normal distribution is symmetrical around the mean, so the areas from each Z score to the mean are equal and their sum gives the total area between these Z scores.

To Find Proportion of the Area Under the Normal Curve