A city police chief decides to do an annual review of the police department by checking the number of monthly complaints. If the total number of complaints in each of the 12 months were 15, 18, 13, 12, 16, 20, 5, 10, 9, 11, 8, and 3 and the police chief wants a z=1.65 confidence level to control the number of complaints. What is the lower control limit in the control chat? Select one: a. 17.307 b. 12.586 c. 0 d. 6.033