1.

The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is

Answer» Mean of 25 observations =` (36xx 25) =900`
Sum of 25 observations = `(36 xx 25) =900`
Mean of first 13 observations =32.
Sum of first 13 observations `= (32 xx 13) = 416`
Mean of last 13 observations = 40
Sum of last 13 observations =` ( 40xx 13) = 520`
13th observation
= ( sum of first 13 observations) + ( sum of last 13 observations) - ( sum of 25 observations )
= ( 416 + 520) -(900) = 936 -900 = 36


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