Below is the actual price and dividend data for three companies for each of seven months. Note that a dividend entry on the same line as a price indicates that the retum between that time period and the previous consisted of a capital gain (or loss) and the receipt of the dividend. a. Compute the rate of retum for each company for each month. b. Compute the average rate of retum for each company. . Compute the standard deviation of the rate of retum for each company. d. Compute the conelation coefficient between all possible pairs of securities. c. compute the average return and standard deviation for the following portfolios: 21A+21B 21A+21C21B+21C31A+21B+32C