Question

In the last 5 years, tesla had an average monthly return of 4.73% with a standard deviation of 16.8%. over the same period, starbucks inc had an average monthly return of 1.72% with a standard deviation of 5.6%. what was the standard deviation of a portfolio of 50% tslaand 50% sbux?

Answer 1

The expected return of the portfolio consisting of 50% tsla and 50% sbux will be given by:
E(r)=WbReturn+WaReturn
E(r)=0.5(4.73)+0.5(1.72)
E(r)=2.365+0.86
E(r)=3.225%