Question 9.RQ.22: The probability distribution of expected future returns are ......

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
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(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

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