The returns for the past four years on Carter Enterprises stock and the S&P 500 (a proxy for the market portfolio) are listed below:

Carter Enterprises	S&P 500
-0.05	-0.12
0.05	0.01
0.15	0.10
0.10	0.05

a. Calculate the mean (average) return for both Carter Enterprises and the S&P 500.

b. Calculate the variance of return for both Carter Enterprises and the S&P 500.

c. Calculate the correlation of return between Carter Enterprises and the S&P 500.

d. Calculate the beta for Carter Enterprises (relative to the S&P 500).