A convenience store has four available parking spaces.?

A convenience store has four available parking spaces. The owner predicts that the duration of customer shopping (the time that a customer’s vehicle will occupy a parking space) is exponentially distributed with a mean of 6 minutes. The owner knows that in the busiest hour customer arrivals are exponentially... show more A convenience store has four available parking spaces. The owner predicts that the duration of customer shopping (the time that a customer’s vehicle will occupy a parking space) is exponentially distributed with a mean of 6 minutes. The owner knows that in the busiest hour customer arrivals are exponentially distributed with a mean arrival rate of 20 customers per hour. What is the probability that a customer will not have an open parking space available when arriving at the store?
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