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on a particular motorway bridge, breakdowns occur at a rate of 3.2 a week. Assuming that...

on a particular motorway bridge, breakdowns occur at a rate of 3.2 a week. Assuming that the number of breakdowns can be modeled by a Poisson distribution, find the probability that
a) fewer than the mean number of breakdowns occur in a particular week,
b) more than five breakdowns occur in a given fornight
c) exactly three breakdowns occur in each of four successive weeks
Math   Statistics-And-Probability   
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