Perform the indicated operations and simplify the expression. 
Definitions:
Normally Distributed
Describes a symmetrical, bell-shaped distribution of data points around the mean, where most observations cluster around the central peak and the probabilities for values further away from the mean taper off equally in both directions.
Standard Deviation
Standard deviation is a statistical measure that quantifies the amount of variability or dispersion of a set of data points around the mean.
Job Performance Ratings
Evaluations used to measure an employee's effectiveness and productivity in their job roles.
Gender Differences
The distinctions, whether real or perceived, between the behaviors, desires, attitudes, and performance of men and women.
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