Calculate the volatility standard deviation of a portfolio


The following table looks similar, but is the monthly returns for both companies in 1992.
Calculate the volatility (standard deviation) of a portfolio that is 55% invested in Coca-Cola and 45% invested in Exxon Mobil stock.
For this problem, please use two different Variance formulas and compare how results differ.
Formula #1: Var(Rp) = x21Var(R1) + x22Var(R2) + 2x1x2Cov(R1R2)
Formula #2: Var(Rp) =x21STD(R1) + x22STD(R2) +2x1x2Corr(R1R2)STD(R1)STD(R2) 

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Finance Basics: Calculate the volatility standard deviation of a portfolio
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