The average of the squares of deviation of the values from arithmetic mean is called

If the mean of 10 observations is 50 and the sum of the squares of the deviations of the observations from the mean is 250 , such the coefficient of variation of those observations is

If the mean of 10 observations is 50 and the sum of the squares of the deviations of the observations from the mean is 250, then the coefficient of variation of those observations is

Find the mean deviation of first 7 natural numbers from their mean.

The men deviation of first 7 natural numbers from mean is

The mean deviation about the mean for the data is

Find the mean deviation about the mean for the data in

Find the mean deviation about the mean for the data in