The following are the monthly rates of return for Madison Cookies and for Sophie Electric during a six$-$month period.

Compute the following. Do not round intermediate calculations. Round your answers to four decimal places.

a$.$ Average monthly rate of return $R_i$ for each stock.

Madison Cookies:

Sophie Electric:

b$.$ Standard deviation of returns for each stock.

Madison Cookies:

Sophie Electric:

c$.$ Covariance between the rates of return.

d$.$ The correlation coefficient between the rates of return.

Would these two stocks be good choices for diversification? Why or why not?