Below is actual price and dividend data for three companies for each of seven months.

a$.$ Compute the rate of return for each company for each month

b$.$ Compute the average rate of return for each company

c$.$ Compute the standard deviation of the rate of return for each company

d$.$ Compute the correlation coefficient between all possible pairs of securities

e$.$ Compute the average return and standard deviation for the following portfolios

a$.\frac{1}{2}A+\frac{1}{2}B$

b$.\frac{1}{2}A+\frac{1}{2}C$

c$.\frac{1}{2}B+\frac{1}{2}C$

d$.\frac{1}{3}A+\frac{1}{3}B+\frac{1}{3}C$