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You have determined that waiting times at a toll booth are uniformly distributed over the interval 30 to 90 seconds. What formula would you use in Excel to generate random values in this range that follow the uniform distribution? a) =30+(90+30)RAND() b) =30+(9030)RANDO) c) =(9030)RAND() d) =(90+30)RANDC) The number of units expected to be sold is uniformly distributed between 300 and 500 . If r is a random number between 0 and 1 , then the proper expression for sales is 300+500(r) r+300. 200(r) 300+r(200). You have determined that waiting times at a toll booth are uniformly distributed over the interval 20 to 60 seconds. The first random number your simulation returns is 0.4732. What is the waiting time that this random number generates? a) 48.928 seconds b) 88.928 seconds c) 38.928 seconds d) 78.928 seconds Question 40 ( 5 points) Which one is INCORRECT about simulation? a) Simulation is an optimization technique. b) Simulation is a method that uses repeated random sampling of values in order to represent uncertainty in a model that represents a real system and computes the values of model outputs. c) Simulation is a trial-and-error approach to problem solving. d) Trials of a simulation show what would happen when values of the probabilistic input change