Question 5. An investor buys $1000 of shares in Centerpoint Energy each month for six months at prices of $20.00, $22.00, $23.00, $24.00, $22.00, and $23.00 respectively. (a) What is the arithmetic average of these prices? (b) Calculate the number of shares the investor buys each month (fractional shares to three decimal places are allowed by his brokerage). (c) Find the total number of shares he buys and the average cost for his purchases