Answers

2016-03-21T12:56:12+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
2 5 2
this is the answer
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