Youinvest1,000eurosintoTelefonica,whichhasastandarddeviationof18%,and invest 500 euros in the risk-free asset. What is the standard deviation of your portfolio?
The standard deciation of the risk free assets will be zero as the return is guaranteed. so, it doesn't carry any risk.
Total Amount invested = Amount invested in Telefonica + amount invested in risk free invested
= 1000 + 500
= 1500
Weightage of Telefonica = 1000 / 1500
= 2/3
In this case,
Standard Deviation of portfolio = (Weightage of telefonica ^2 * Standard Deviation of telefonica^2)^(1/2)
= ((2/3)^2 * 18^2)^(1/2)
= ( 4/9 * 324)^(1/2)
= (144)^(1/2)
= 12
So, the standard deviation of the portfolio is 12.
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