The mean of 23 observations is 14. The mean of first twelve of them is 14 and the last twelve of them is 14. Find the thirteenth observation
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sum of 23 observations =23×14
sum of first 12 observations
=12×14
sum of last 12 observations
=12×14
thirteenth observations
=12×14+12×14-23×14
=14
sum of first 12 observations
=12×14
sum of last 12 observations
=12×14
thirteenth observations
=12×14+12×14-23×14
=14
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