S & S Printing has 15 employees and 5 job classifications. Positions and wages for these employees

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S & S Printing has 15 employees and 5 job classifications. Positions and wages for these employees are given in the table.
Number Weekly Salary Job Supervisor Printers 1 $2400 1200 1500 1100 1640 3 2 1 Camera-Darkroom Secretaries Delivery

(a) What is the mean salary per job classification?
(b) What is the mean salary per person?

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