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a)If one parking place is available and it will take you one minute to reach the parking area,what is the probability that a space will still be available when you reach the lot? (Assume that no one leaves the lot during the one-minute interval.)

b)Let W denote the number of drivers who wish to park during a one-minute interval.Derive the probability distribution of W.

could anyone help me to solve this problem? I've no idea about this.