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QUESTION 31 Suppose that the average time before breakdown is normally distributed with a mean of 2.5 weeks and a standard deviation of .4 weeks. If breakdowns cost an average of $1,200 and preventive maintenance costs $800, what is the optimal maintenance interval? O Every 67 weeks O Every .33 weeks O Every 2.67 weeks O Every 3.25 weeks O Every 3.12 weeks QUESTION 32 Besides project activities, the primary information that all Gantt charts illustrate is: O project budget and when activities occur. O cost of activities and delays in the schedule. O planned duration of activities and when they occur in the schedule. O project budget and staffing levels. O critical path and project budget. QUESTION 33 In the EOQ model with planned shortages, if annual demand is 500, holding cost is $200, ordering cost is $15, and back-order cost is $400, the quantity back ordered per replenishment cycle, rounded to the next whole number, is: O O 05 O 12 8 submit. Click Save All Answers to save all answers