Scenario | return | Deviation=Return-Expected return | Deviation^2 | |
1 | 10.000% | 3.500% | 0.123% | |
2 | 17.000% | 10.500% | 1.103% | |
3 | 5.000% | -1.500% | 0.023% | |
4 | -5.000% | -11.500% | 1.323% | |
5 | -8.000% | -14.500% | 2.103% | |
6 | 9.000% | 2.500% | 0.063% | |
7 | 10.000% | 3.500% | 0.123% | |
8 | 14.000% | 7.500% | 0.563% | |
Total | 52.000% | 5.420% | ||
So expected return is 6.5% | 52%/8 | |||
Stock variance-5.42%/8 | 0.6775% | |||
Stock Standard deviation | '0.6775%^(0.5) | |||
Stock Standard deviation | 8.23% | |||
Scenario | return | Deviation=Return-Expected return | Deviation^2 | |
1 | -3.000% | -8.750% | 0.766% | |
2 | 10.000% | 4.250% | 0.181% | |
3 | 5.000% | -0.750% | 0.006% | |
4 | 15.000% | 9.250% | 0.856% | |
5 | 12.000% | 6.250% | 0.391% | |
6 | -5.000% | -10.750% | 1.156% | |
7 | 7.000% | 1.250% | 0.016% | |
8 | 5.000% | -0.750% | 0.006% | |
Total | 46.000% | 3.375% | ||
So expected return is 5.75% | 46%/8 | |||
Stock variance-3.375%/8 | 0.4219% | |||
Stock Standard deviation | '0.4218%^(0.5) | |||
Stock Standard deviation | 6.50% | |||
Expected return | Weight | Standard Deviation | ||
Stock A | 6.50% | 35% | 8.2310% | |
Stock B | 5.75% | 65% | 6.4952% | |
Calculation of standard deviation | ||||
The first step is to calculate the covariance: | ||||
COVAB = SDA × SDB × rAB, where rAB is the correlation coefficient between securities A and B. | ||||
Now, calculate the standard deviation for the portfolio: | ||||
[(SDA2 × WA2) + (SDB2 × WB2) + 2 (WA)(WB)(COVAB)]½ | ||||
Let's calcualte the co-variance | =8.2310% * 6.4952% * -0.49 | |||
-0.00262 | ||||
Now lets calculate the SD | ||||
SD portfolio= | ((8.2310%^2 * 35%^2)+(6.4952%^2*65%^2)+(2*35%*65%*-0.00262))^(0.5) | |||
SD portfolio= | 3.769% | |||
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