the time between arrivals of buses follows an exponentialdistribution, with a me

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the time between arrivals of buses follows an exponentialdistribution, with a mean of 60 minutes a)What is the probability that exactly four buses will arriveduring the next 2 hours b)that at least two buses will arrive during the next 2hours? c) that no buses will arrive during the next 2 hours d)A bus has just arrived. what is the probability that it willbe between 30 and 90 minutes before the next bus arrives? with explanation please thx the time between arrivals of buses follows an exponentialdistribution, with a mean of 60 minutes a)What is the probability that exactly four buses will arriveduring the next 2 hours b)that at least two buses will arrive during the next 2hours? c) that no buses will arrive during the next 2 hours d)A bus has just arrived. what is the probability that it willbe between 30 and 90 minutes before the next bus arrives? with explanation please thx

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