The employer mean of his total weekly salary is $1,700
The employer standard deviation of his total weekly salary is $186
Given the following parameters in the question
A mean salary for a 5-day workweek = $1250
A mean salary expenses for the weekend = $450
Mean of his total weekly salary = Mean salary for workweek + mean salary on weekends
Mean of his total weekly salary = $1250 + $450
Mean of his total weekly salary = $1,700
Hence the employer mean of his total weekly salary is $1,700
Similarly for the standard deviation
A standard deviation salary for a 5-day workweek = $129
A standard deviation salary expenses for the weekend = $57
Standard deviation of his total weekly salary =Standard deviation salary for workweek + Standard deviation salary on weekends
Standard deviation of his total weekly salary = $129 + $57
Standard deviation of his total weekly salary = $186
Hence the employer Standard deviation of his total weekly salary is $186
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