Question: please show your work! thanks - I will rate 5 stars w/ work. What is the standard deviation of the returns on a portfolio that

please show your work! thanks - I will rate 5 stars w/ work.
What is the standard deviation of the returns on a portfolio that is invested in stocks A, B, and C? Twenty five percent of the portfolio is invested in stock A and 40 percent is invested in stock C.
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