Customers arrive at a checkout counter in a department store according to a Poisson distribution at an average of seven per hour. During a given hour, what are the probabilities that: A: At least two customers arrive? B: At least two and not more than five customers arrive?
Added by Jonathon C.
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This is the same as finding the probability that 0 or 1 customer arrives and subtracting that from 1. The Poisson distribution formula is given by: $P(X=k) = \frac{e^{-\lambda} \lambda^k}{k!}$ where $X$ is the number of events (customers), $k$ is the desired Show more…
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