The mean and standard deviation of 50 observations are 15 and 2 respectively. It was found that ...

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The mean and standard deviation of 50 observations are 15 and 2 respectively. It was found that one incorrect observation was taken such that the sum of correct and incorrect observations is 70 . If the correct mean is 16 , then the correct variance is equal to
(a) 10
(b) 36
(c) 43
(d) 60
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