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Poisson-problem

Posted: 25/02-2006 16:38
by Snoopy
Phone calls are received at a certain residence as a poisson process with parameter labda = 2 per hour.

a) If Diane takes a 10 min shower, what is the probabilty that the phone rings during that time?

b) How long can her shower be if she wishes the probability of receiving no phone calls to be at most .5?