(Downloading data and descriptive statistics of stocks) Go to http://finance

.yahoo.com. Download monthly stock price data for Oracle Corporation

(ORCL), Microsoft Corporation (MSFT), and IBM Corporation (IBM) for 2013 and 2014. Also, download the same data for Vanguard’s S&P 500 index

(VFINX) for the same period.8 Answer the following questions:

a. What is the mean return, variance, and standard deviation of a portfolio consisting of the three stocks, where wealth is allocated equally among each stock?

b. On average, would you be better off by investing in this portfolio or by investing in S&P 500 index during this period of 2 years?