The following are the historic returns for Chelle Computer Company. Year Chelle Computer General Index

The following are the historic returns for Chelle Computer Company.
Year  Chelle Computer General Index

1 38.0% 16.0%
2 10.0% 14.0%
3 -12.0% -15.0%
4 9.0% 10.0%
5 12.0% 13.0%
6 -5.0% 15.0%

Based on this information, compute the following: 
a. The correlation coefficient between Chelle Computer and the General Index.
b. The standard deviation for the company and the Index.
c. The beta for the Chelle Computer Company.