The mean of 15 observations is 30. If one more observation is included, then the new mean becomes 31 What is the 16th observation
O (A) 44
O (B) 46
O (C) 45
(D) 47
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the mean of 15 observation is 30
total of 30 observation is 30×15=450
mean of 16 observation is 31
total of 31 observation is 31×16=496
so, 16 th observation is 496-450=46
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