The monthly returns for Visa (V) and Pfizer (PFE) for 20182020 are provided in the chart below. In addition, the monthly return for the SPDR S\&P 500 ETF Trust (SPY) is provided; SPY is often used as a proxy for the returns of the S\&P 500, or a broad market index. Using Excel, calculate the arithmetic average monthly returns for V, PFE, and SPY. Also, calculate the standard deviation of returns for each of V, PFE, and SPY