The amount of time needed to wash a car at a car washing station is exponentially distributed with an expected value of 15 minutes You arrive at a car washing station, while the washing station is occupied and one other car is waiting for a washing The owner of this car informs you that the car in the washing station is already there for 10 minutes What is the probability that the car in the washing station will need no more than five other minutes? What is the probability that you have to wait more than 20 minutes before your car can be washed?

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