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Please show all work! (19] The number of care that arrive at a particular trafc light over a 3minute period ie a Poisson random variable

Please show all work!
(19] The number of care that arrive at a particular trafc light over a 3minute period ie a Poisson random variable with parameter A = 2.7. Find the probabilityr that (a) eirraetl},r 4 care arrive at the light over a 3minute period. (b) at least 5 care arrive at the light over a 15minute period

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