The range of 12 observations is 60. If the least observation is 90, then find the greatest observation.

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 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.

The mean of 35 observations is 20. If the mean of the first 18 observations is 16 and that of last 18 observations is 24, find the 18th observation.

The mean of first 8 observations is 18 and last 8 observations is 20. if the mean of all 15 observations is 19, find the 8th observations.

If the mean of 12 observations is 9, find the sum of the 12 observations.

The mean of 16 observations is 16 . If one observation 16 is deleted and three observations 5 , 5 and 6 are included , then find the mean of the final observations .

The mean of 16 observations is 16 . If one observation 16 is deleted and three observations 5 , 5 and 6 are included , then find the mean of the final observations .

The means of 5 observations is 16. Find the sum of these observations.