Question

Find variance of the following stocks A,B and C:

Stock	A	B	C
1	3	19	-2
2	5	17	4
3	7	15	0
4	9	13	8
5	11	11	12
6	13	9	14
8	15	7	-8
9	17	5	16
10	19	3	20

Answer 1

Statement showing variance

	A			B			C
Year	x	(x-X)	(x-X)^2	y	(y-Y)	(y-Y)^2	z	(z-Z)	(z-Z)^2
1	3	-8	64	19	8	64	-2	-9.11	82.9921
2	5	-6	36	17	6	36	4	-3.11	9.6721
3	7	-4	16	15	4	16	0	-7.11	50.5521
4	9	-2	4	13	2	4	8	0.89	0.7921
5	11	0	0	11	0	0	12	4.89	23.9121
6	13	2	4	9	-2	4	14	6.89	47.4721
8	15	4	16	7	-4	16	-8	-15.11	228.3121
9	17	6	36	5	-6	36	16	8.89	79.0321
10	19	8	64	3	-8	64	20	12.89	166.1521
	99		240	99		240	64		688.8889
(/) n	9		9	9		9	9		9
Expected return(X,Y,Z)	11.000			11.000			7.111
Variance			26.667			26.667			76.543