the time between the arrival of two consecutive customers at a postoffice is 3 minutes, on average. Assuming that customers arrive in accordance with a Poisson process, find the probability that tomorrow during the lunch hour (between noon and 12:30 pm) fewer than seven customers arrive

I'm a little confused... because the arrival of 2 customers is 3 minutes, on average. So, lambda should be 2/3 instead of 1/3??? can you explain me how do you assume that?

Oct 14th, 2015

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