The probability distribution of expected future returns are as follows:
\, Compute the (a) standard deviation of expected returns of each share, (b) coefficient of variation. Which share is more risky? Why?
Return\>on\>shares\>(percentage) | Probability \, |
|
Y | X | |
(18) | (16) | 0.1 |
12 | 2 | 0.2 |
18 | 8 | 0.4 |
32 | 12 | 0.2 |
40 | 20 | 0.1 |
(b) Coefficient of variation:
\, Share X = 8.94/6.4 = 1.4
\, Share Y = 14.98/18.2 = 0.82
\, Share X is more risky since it has larger coefficient of variation (a
\, measure of relative risk).
(a) Computation\> of \>standard\> deviation\> of\> shares,\> X\> and \>Y
(r_i – r)^2P_i (%) (6) |
(r_i – r)^2 (5) |
(r_i – r) (%) (4) |
r_iP_i(%) (3) |
P_i (2) |
r_i (%) (1) |
|
Share X : | ||||||
50.2 | 501.8 | (22.4) | (1.6) | 0.1 | (16) | |
3.9 | 19.4 | (4.4) | 0.4 | 0.2 | 2 | |
1.0 | 2.6 | 1.6 | 3.2 | 0.4 | 8 | |
6.3 | 31.4 | 5.6 | 2.4 | 0.2 | 12 | |
18.5 | 185.0 | 13.6 | 2 | 0.1 | 20 | |
σ² = 79.9 | \bar{X}=6.4 | |||||
\, Since σ² = 79.9, σ = \sqrt{79.9} = 8.94 per cent | ||||||
Share Y : | ||||||
131.04 | 1,310.4 | (36.2) | (1.8) | 0.1 | (18) | |
7.68 | 38.4 | (6.2) | 2.4 | 0.2 | 12 | |
0.02 | 0.04 | (0.2) | 7.2 | 0.4 | 18 | |
38.08 | 190.4 | 13.8 | 6.4 | 0.2 | 32 | |
47.52 | 475.2 | 21.8 | 4 | 0.1 | 40 | |
σ² = 224.34 | \bar{X}=18.2 | |||||
\, Since σ² = 224.34, σ = \sqrt{ 224.34} = 14.98 per cent |