Which of the following would be the mean of this data set: 5, 28, 12, 56, 4, 2, 30, 21
18.24
19.75
17.06
16.50
solution:
The mean of sample is 
x/n
= (5+ 28+ 12+ 56+4+ 2+ 30+ 21/ 8)
=19.75
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