Question

the mean of 25 observations is 36. if the mean of first 13 observation is 32 and that of the last 13 is 39, the 13th observation is ______ (A)25 (B)23 (C)20 (D)35

Answer 1

Hi friend ,
The answer will be B) 23
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Mean of 25 observation = 36
Sum of 25 observations = 36×25
= 900

Mean of first 13 observations = 32
Sum of first 13 observations = 32×13
=416

Mean of last 13 observations = 39
Sum of last 13 observations= 39×13
= 507

13 observation = (416+507)-900
13 observation= 923-900
13 observation = 23
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Answer 2

Pls answer apko helpfully ho tho follow me