Number of Commercial Mortgages Approved Frequency 0 13 25 2 32 3 17 4 9 5 6 6 7 a. Calculate the expected number of mortgages approved per week. b. Calculate the standard deviation. c. What is the probability that there will be more than one commercial mortgage approved in a given week?5.6 The manager of the commercial mortgage department of a large bank has collected data during the past two years concerning the number of commercial mortgages approved per week. The results from these two years (104 weeks) are as follows