Complete the following statement that finds the average salary of employees.Assume that employeeStream is a stream of Employee objects and the getSalary method returns the employee's salary as an integer. 
Definitions:
Standard Deviation
An indicator of the extent of variability or spread within a set of numbers, showing the degree to which these numbers deviate from the average value.
Peaked
Describes a data distribution's summit or highest point, indicating the mode or the most frequent value in the set.
Normal Probability Distribution
A bell-shaped distribution that is symmetrical about the mean, showing how data points are likely to be distributed in a set where most occurrences take place around the average.
Bell-shaped
A description often used for the symmetrical, rounded shape of a normal distribution curve.
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