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A service station experiences ten vehicles arriving in an hour

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A service station experiences ten vehicles arriving in an hour. Assume that the arrival of vehicles is independent and no more than one vehicle arrives at the same time. Considering a particular hour at the service station,

1. What is the probability that there are at most five vehicles arriving to the service station?

2. If the number of vehicles arrived exceeds ten vehicles, the service station needs to arrange additional parking space. What is the probability that the service station needs to arrange?