The mean deviation from the mean for the set of observations; – 1, 0, 4 is:
Find the mean deviation taking deviation from the mean for the given individual observation 10, 20, 30, 40, 50, 60, 70
State with reason whether the following statements are True or False:
(i) Sum of square of the deviations of items from their arithmetic mean is the maximum.
(ii) Standard Deviation is based on all values.
(iii) For a given set of observations, standard deviation is always more than mean deviation from mean.