Answer Happy

The following spreadsheet contains monthly returns for Cola Co.
and Gas Co. for
2013.
Using these​ data, estimate the average monthly return and
the volatility for each stock.
Month
Cola Co.
Gas Co.
January
2.80​%
5.90​%
February
3.00​%
−1.50​%
March
−1.80​%
−1.30​%
April
4.70​%
2.50​%
May
−0.60​%
−1.70​%
June
11.10​%
14.40​%
July
1.60​%
9.30​%
August
−0.50​%
−2.80​%
September
−5.00​%
−1.20​%
October
−1.40​%
0.00​%
November
1.50​%
12.00​%
December
−0.70​%
3.00​%