Question 84214

SEE THE FOLLOWING EXAMPLE AND TRY.
COME BACK IF IN DIFFICULTY
TABULATE AND DO AS FOLLOWS.HOPE IT IS CLEAR.PLEASE COME BACK IF IN DOUBT			
	x	X=x-M	X^2
1	4	-2.4	5.76
2	5	-1.4	1.96
3	8	1.6	2.56
4	7	0.6	0.36
5	9	2.6	6.76
6	8	1.6	2.56
7	7	0.6	0.36
8	3	-3.4	11.56
9	6	-0.4	0.16
10	7	0.6	0.36
								
SUM=S=	64	S.S.D. =	32.4	S.S.D=SUM OF SQUARES OF DEVIATIONS				
N0.=N =	10	N0. = N = 	10					
MEAN=M=	6.4	VARIANCE=V=	3.24	=MEAN OF SUM OF SQUARES OF DEVIATIONS				
		S.D = SQRT.(V)	1.8	=ROOT OF MEAN OF SUM OF SQUARES OF DEVIATIONS