Answers

2016-03-15T14:55:58+05:30
Mean = Sum of Observation  / No. of Observation 
9 = 5 + 7 + 8 + 12 + 6 + 10 + 9 + 11 + x / 9
81 = 68 + x
x = 81 - 68
x = 13

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2016-03-15T14:58:34+05:30
5+7+8+12+6+10+9+11+x/9 = 9
68+x/9 = 9
68+x=9*9
68+x=81
x=81-68
x=13

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