a) Explain the four phases of a simulation process. [ 6 Marks] b) Haggins plumbing and Heating maintains a stock of 30 gallon hot water heaters that it sells to home owners and installs for them. The owners likes the the idea of having large supply on hand so as to meet all customer demand, but he also recognizes that it is expensive to do so. He examines hot water heater sales over the past 50 weeks and notes the following: Hot water heater sales Number of weeks this number per week was sold 4 6 5 5 9. 6 9 7 8 12 8 9 7 10 3 Total 50 Using random numbers given below, 10, 24, 03, 32, 23, 59, 95, 34, 34, 51, 08, 48, 66, 97, 03, 96, 46, 74, 77, 44