Variance of Individual Observations

Computation of mode of a series of individual observations - Method

Suppose arithmetic mean of "10" observations is "10" and variance is "40." Further let arithmetic mean and variance of "6" observations from these "10 observations be "6" and "20" respectively.Then the variance of remaining observations is

If the mean and variance of five observations are (24)/5 and (194)/(25) respectively and the mean of first four observations is 7/2 , then the variance of the first four observations in equal to

Variance of 3n observation is 4 , mean of first 2n observations is 6 and mean of next n observations is 3 . If 1 is added in first 2n observation and 1 is subtracted from last n observations than find new variance

The mean and variance of five observations are 6 and 4 respectively.If three of these are 5,7 and 9, find the other two observations.

The variance of 15 observations is 8. If each observation is multiplied by 4, then the variance of new observation is ……

Mean of 5observations is 7. If four of these observations are 6,7,8,10 and one is missing then the variance of all the five observations is

Find the variance of following observations 30, 40, 50, 60, 70.