The monthly adjusted closing stock prices for Tesla and Exxon Mobile in 2019 are as follows:

Date	TESLA	Exxon Mobil
1/1/2019	307.02	69.930687
2/1/2019	319.88	75.417877
3/1/2019	279.86	77.963036
4/1/2019	238.69	77.461288
5/1/2019	185.16	68.285187
6/1/2019	223.46	74.786964
7/1/2019	241.61	72.571564
8/1/2019	225.61	66.832985
9/1/2019	240.87	69.7686
10/1/2019	314.92	66.764824
11/1/2019	329.94	67.318146
12/1/2019	418.33	69.779999

Use Excel to calculate the monthly expected return and standard deviation of returns for both stocks, what is the correlation between their returns. If you invest 60% of your money in Tesla and 40% of your money in Exxon Mobile, what is expected return and standard deviation of the portfolio? Use Excel spreadsheet to show a chart of efficient frontier similar to Figure 1.2 with alternative risk-return combinations from the two investments.