Answers

2014-07-21T18:19:08+08:00
Mean  =  \frac{ x_{1} + x_{2} + ... + x_{n} }{n}

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
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