a large mailorder firm employs numerous persons to take phon

a large mail-order firm employs numerous persons to take phone orders. Computers on which orders are entered also automatically collect date on phone activity. One variable useful for planning staffing levels is the number of calls per shift handled by each employee. From the data collected on 25 workers, calls per shift were( courtesy of Land\'s End) 118 118 57 92 127 109 96 68 73 69 106 91 93 94 102 105 100 104 80 50 96 82 72 108 73 Calculate the sample mean.

Solution

the sample mean is the average of the data given to us , that is we are supposed to add the individual phone activity of the 25 workers and then divide the sum by the number of workers that is 25 in this case.

=> the sample mean = [118+ 118+ 57+ 92+ 127+ 109+ 96+ 68+ 73+ 69+ 106+ 91+ 93+ 94+ 102+ 105+ 100+ 104+ 80+ 50+ 96+ 82+ 72+ 108+ 73]/25 = 2283/25 = 91.32