Answers

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2016-01-14T15:11:29+05:30
Observation = 4,5,2,x,6,5
Mean = 6

Mean = Sum of Observation/Total Observation
       6 = 4+5+2+X+6+5 / 6
       6 =22 + X / 6 
     36 = 22 +X 
     X = 36 - 22
     X = 14
2 5 2