To Find Proportion of the Area Under the Normal Curve

Multiple Choice

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.