The mean of 15 observation is 16.4 .If one observation is cancelled , the mean of remaining data is 17. The cancelled observation is ______

Answers (1)

Given

mean of 15 observations  = 16.4
sum of all abseravations/number of observations=16.4
(sum of all observations)/15=16.4
sum of all observations=16.5 *15 = 247.5
if 1 observation is cancelled, mean = 17
sum of all observartions=17*14=238
so the cancelled observation = 247.5 - 238 =9.5
                                      

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