1. The Excel file Stock Data contains monthly data for several stocks and the S&P 500 Index (i.e., the market).
   1. Compute the average monthly return for PFE.
   2. Compute the annualized return for PFE.
   3. Compute the annual risk (i.e., variance and standard deviation) for PFE.

PFE	S&P 500
4.31%	2.40%
7.61%	5.20%
-0.56%	4.00%
-5.94%	-0.50%
14.35%	9.00%
6.54%	1.90%
-0.90%	-0.40%
-1.45%	-2.30%
10.47%	2.10%
-6.24%	2.40%
-1.44%	-6.70%
-13.12%	1.30%
2.76%	2.60%
-6.39%	-2.50%
17.24%	9.80%
-2.66%	-0.70%
18.13%	-0.30%
-5.49%	-9.00%
-0.53%	-4.90%
3.01%	-0.40%
11.90%	6.40%
0.00%	2.70%
11.30%	4.40%
17.59%	7.20%
1.90%	2.40%
1.87%	0.30%
8.65%	4.30%
-5.73%	-4.60%
11.49%	4.70%
6.43%	2.40%
-0.57%	-1.60%
9.98%	1.30%
-6.88%	-4.00%
26.55%	11.40%
-13.09%	-1.90%
2.57%	1.30%
-6.71%	-2.00%
2.88%	2.90%
4.91%	0.50%
-2.18%	-1.50%
7.36%	4.00%
-0.97%	-2.00%
-3.24%	1.20%
1.17%	0.40%
3.81%	3.40%
-7.20%	1.30%
-8.97%	0.70%
-10.96%	1.40%
-0.56%	4.00%
-5.94%	-0.50%
14.35%	9.00%
-13.12%	1.30%
2.76%	2.60%
-6.39%	-2.50%
1.90%	2.40%
1.87%	0.30%
8.65%	4.30%
-6.71%	-2.00%
3.81%	3.40%
2.88%	2.90%