The mean and standard deviation of two series X and Y are :
`{:(,"Series X" , "Series Y") , ("Mean" , 50 , 80), (S.D. , 10 , 20):}`
Which series shows lower variation ?

The mean and standard deviation of marks obtained by sections A and B are : {:(,"Series A" , "Series B") , ("Mean" , 20 , 21), (S.D. , 6 , 9):} Which series shows lower variation ?

Calculate standard deviation of the following series:

Deviation of two series X and Y are shown . Calculate coefficient of correlation .

The mean deviation of the series a, a+d, a+2d, . . . , a+2n from its mean is -

The mean deviation of the series 3, 4, 5, 6, 7 about the median is

Find the standard deviation of the following discrete series .

Find out mean deviation of the following series from mean and median:

Find out standard deviation and its coefficient of the following series: