(Q5) Suppose the number of cracks per concrete specimen for a particular type of cement mix has on the average is 2.5 cracks per specimen. a) Find the expected and standard deviation of the number of cracks per concrete specimen. b) Find the probability that a randomly selected concrete specimen has exactly five cracks. c) Find the probability that a randomly selected concrete specimen has more than two cracks. d) Find the probability that a randomly selected concrete specimen has less than two cracks. (Q6) to compare investing in two companies A and B. The mean profit per month and SD are given in the below table: Company A B Mean Profit $240 $110 SD $13.50 $6.50 If the risk rate of interest to 0.1% per month. Use the Sharpe ratio to compare investing in the two companies