3 An average of 40 cars per hour arrive to be painted at a single-server GM painting...

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3 An average of 40 cars per hour arrive to be painted at a single-server GM painting facility. 95% of the cars require 1 minute to paint; 5% must be painted twice and require 2.5 minutes to paint. Assume that interarrival times are exponential.

a On the average, how long does a car wait before being painted?
b If cars never had to be repainted, how would your answer to part

(a) change?

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