Calculate the covariance, and correlation coefficient between both stocks

Given the following returns for Stock X and stock Y

Stock X % return		Stock Y % return
2		1
4		3
6		5
8		6
12		9

1. Calculate the variance, and standard deviation of each stock return, assume the above is a sample (i.e. divide by n-1 instead of n). Interpret the results for x only.
2. Calculate the covariance, and correlation coefficient between both stocks
3. Assume a portfolio made of both stocks (60% in stock X and 40% in stock Y) calculate the expected return and standard deviation of the portfolio.

Solution: