The mean of first two observations is 6 & the mean of first three observations is 7. The third observation is-

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

The mean of 53 observations is 36. Out of these observations, the mean of first 27 observations is 32 and that of the last 27 observations is 40. The 27th observation is

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

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

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 11 obervation is 50. If the mean of first Six observation is 49 and that of last six observation is 52, then find sixth observation.