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 isA. 23B. 36C. 38D. 40

Answer» Correct Answer - B
Given, mean of 25 observations = 36
`therefore` Sum of 25 observations `=36 xx 25=900`
Now, the mean of first 13 observations`=13 xx 32=416`
and the mean of last 13 observations =40
`therefore` sum of last 13 observations = (Sum of last 13 observations + Sum of first 13 observations)-(Sum of 25 observations)
`=(520-416)-900=936-900=36`
Hence, the 13th observation is 36.


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