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In a restaurant, the mean annual salary of the 4 chefs is P68,000, and the mean annual salary of the 8 waiters is P47,000. What is the mean annual salary of all 12 employees?

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Mean  = [tex] \frac{ x_{1} + x_{2} + ... + x_{n} }{n} [/tex]

total salry of chefs = 4 * 68000 = 272000
total salary of waiters = 8 * 47000 = 376000

mean annual salary of all 12 employees = ((4*68000)+(8*47000))/12 = 54000