Question: During Marks presentation he mentioned that the first time he gave a presentation in our class he taught standard deviation, and then said you dont

During Marks presentation he mentioned that the first time he gave a presentation in our class he taught standard deviation, and then said you dont have to know it..:-), however my boss expects us to know how it is calculated so if you have 3 stocks in your portfolio and for last 4 years received a 20%, 15%, 10%, 15% return what will be your standard deviation for those 4 years?

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