The sum of deviations of n observations about 25 is 25 and sum of deviations of the same n observations about 35 is -25 . The mean of observations is

The sum of deviations of n observations about 25 is 25 and sum of deviations of the same n observations about 35 is -25. Find the mean of the observations.

The sum of deviations of ‘n’ observa tions from 25 is 25 and sum of devia tions of the same’n’ observations from 35 is-25. Find the mean of the observations.

If the algebraic sum of deviations of 20 observation from 30 is 20, then the mean of observation is :

If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is

If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is

If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is

If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is

Show that the sum of deviations of a set of observations about their mean is Zero.

If the mean of n observations is 5 and sum of observations is 25, then find n .