If the mean of 15 observations are 12 and S.D is 3, But upon Rechecking we found that observation 10 was wrongly written as 12, if the new mean is `mu` and new variance is `sigma^2` then find the value of `15(mu+mu^2+sigma^2)`

The mean of 10 observations was calculated as 40. It was detected on rechecking that the value of 45 was wrongly copied as 15. Find the correct mean.

If the mean of five observations x,x+3,x+6,x+9 and x+12 is 15, then find the mean of first three observations

If the mean of five observations x,x +3, x+6, x+ 9 and x+ 12 is 15, then find the mean of first three observations

The mean of 20 observation is 12. On checking, it was found that two observation were wrongly copied as 3 and 6. If wrong observation are replaced by correct values 8 and 4, then the correct mean is

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

The mean of 5 observations is 4.4 and their variance is 8.24. If three of the observations are 1,2 and 6, find the other two observations.

The mean and standard deviation of "15" observations were found to be "12" and "3" respectively.On rechecking it was found that an observation was read as "10" in place of "12" .If mu and sigma^(2) denote the mean and variance of the correct observations respectively,then 15(mu+mu^(2)+sigma^(2)) is equal to