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The time between successive arrivals of calls to emergency service is random variable which follows exponential...

The time between successive arrivals of calls to emergency service is random variable which
follows exponential distribution. It was observed that on average calls arrive to emergency
service every four minutes (1 / λ = 4min) and average number of calls in one minute is λ = 0.25 calls/ 1 min

The probability that the time between successive calls is less than 2 minutes is ______

A call just arrived to emergency service. The probability that next call will arrive to emergency service no sooner than in 3 minutes is __________.

The probability that the time between successive calls is between 6 and 8 minutes is ______

Math   Statistics-And-Probability   
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