Mean of `35` observations is `75` .The mean of first `18` observations is `70` and the mean of last `18` observations is `80` .Then the `18^(" th ")` observation is `

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

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 :

The mean of 25 observations is 36. The mean of first 13 observations is 32 and that of last 13 observations is 39. What is the value of 13^(th) observation ?

The mean of 10 observations is 12. If mean of first 6 observations is 13. Find the mean of remaining 4 observations.

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

The mean of 9 observations is 36. If the mean of the first 5 observations is 32 and that of the last 5 observations is 39, then the fifth observation is

The mean of 9 observations is 36 .If the mean of the first 5 observations is 32 and that of the last 5 observations is 39 ,then the fifth observation is

The mean of first three observations is 15 and the mean of next two observation is 20. The mean of all five observations is-

If the mean of five observations is 11, find the mean of first three observations.

The mean of 9 observations is 36. If the mean of the first 5 observations is 32 and that of the last 5 observations is 39, then the fifth observation is a)28 b)31 c)43 d)37