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The mean of 25 observations is 36. If th...

The mean of 25 observations is 36. If the mean of the first 13 observations is 32 and that of the last 13 observations is 39 then the `13^(th)` observation is :

A

32

B

30

C

28

D

23

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Knowledge Check

  • The mean of 20 observations is 30. If the mean of first 15 observations is 32, find the mean of last 5 observations.

    A
    22
    B
    24
    C
    26
    D
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  • 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

    A
    `23`
    B
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    C
    `38`
    D
    `40`

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    A
    36
    B
    38
    C
    40
    D
    23

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