Question 3 (15 points) a) (8 points) Determine the utilization factor for the following tabulated maintenance work sampling observations: ACTIVITY Minor repair Preventive maintenance Emergency repair Housekeeping Record keeping Personal Idle FREQUENCY 746 1284 287 350 146 253 159 b) (7 points) After studying the preventive maintenance activity, you can state with 95 percent confidence that the operator will do preventive maintenance for ht h of a 8 hours day