Answers

2016-04-11T17:25:01+05:30
No. of observations = 5
we should add all of them = 5x + 90
we should divide it by 5= 5x + 90/5 = x + 18 is the average
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2016-04-11T17:33:12+05:30
 Mean =   \frac{x+77 + x+7 + x+5 + x+3 + x-2}{5}
Mean =  \frac{5x+90}{5}
Mean = x+18
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