Below are the prices for ABC Corporation and the S&P 500 Index.
a. Calculate the monthyly holding-eriod returns for ABC and the S&P 500 Index.
b. What are the average monthly returns and stardard deviations for each?
DATA
a.
Month	ABC Corporation		S&P 500 Index
	Prices	Returns	Prices
-21	48.55		2,025
-21	48.11	-0.91%	2,024
-21	48.95	1.75%	2,026
-21	50.55	3.27%	2,013
-21	50.82	0.53%	2,014
-21	52.55	3.40%	2,018
-21	53.75	2.28%	2,023
-21	54.05	0.56%	2,025
-22	47.95	-11.29%	1,995
-22	51.33	7.05%	2,095
-22	51.58	0.49%	2,096
-22	52.42	1.63%	2,088
-22	53.77	2.58%	2,105