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Given that, 75% of the vehicles passing through a checkpoint are from wilkin the slate 80, 25. of thi vehicles are from thi out of slate Therfore, probability that the vehicle which passing through a check point , p= 0.25 Let random variable X represent the number , 9 vehicles which are from out of plate The probablety that the vehicle is from out of stat p= 0.25 if we consider an event that a vehicle is from out of slate as a succen. then scandom variable X represents a binomial random variable with parameter n: 9, 1: 0.275 We need to find the probablety what fewer know 4 of next J vehicle on from out of mate