Question

You have the following rates of return for a risky portfolio for several recent years: 2016...

You have the following rates of return for a risky portfolio for several recent years:
2016 31.23%
2017 19.67%
2018 -8.37%
2019 22.65%

a) what was rhe average, or mean return over the period?

b) what was the standard deviatin of retirn over the sample period?
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Answer #1

a)

average = (31.23% + 19.67% - 8.37% + 22.65%)/4

= 16.295%

b)

variance = [(0.3123-0.16295)^2 + (0.1967-0.16295)^2 + (-0.0837-0.16295)^2 + (0.2265-0.16295)^2]/3

= 0.02943977

standard deviation = sqrt(variance)

= sqrt(0.02943977)

= 17.16%

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