Consider a two-stage process. The processing time for stage 1 is 3 min (constant), while that for stage 2 is normally distributed with a mean of 9 min and standard deviation of 2 min. Since the stage 2 processing time is a random variable, the flow rate of the process will also vary. a. What is the maximum flow rate of this process? b. What is the probability that the flow rate of the process will be 20 units per hour? (Given: for a normal distribution, P(-3 < Z < 3) = 0.9973)



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