Sum of 12 observations is 256,if one of the observation 14 is deketed find the mean of remaining observation​

The arithmetic mean of 10 observations is 45. If one of the obsservations, 54, is deleted, then find the mean of the remaining observations.

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 12 observations is 75. If two observations are discarded, then the mean of the remaining observations is 65. What is the mean of the discarded observations?

The A.M. of n observation is X. If the sum of n-4 observation sis K, then the mean of remaining observations is

The AM of n observations is M. If the sum of n-4 observations is a, then the mean of remaining 4 observations is

Find the mean of the following observations

AM of n observations is M.If the sum of (n-5) observations is R, then mean of remaining 5 observations is

The mean of 10 observation is 15. If one observation 15 is added, then find the new mean.