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Let Y be the number of calls to a particular hotline within 10 min. Suppose Y...

Let Y be the number of calls to a particular hotline within 10 min. Suppose Y is a Poisson random... Let Y be the number of calls to a particular hotline within 10 min. Suppose Y is a Poisson random variable with mean of 3. Find the probability that there are at most 4 calls given that there are already 2 calls within the 10 min.

THIS IS NOT A STRAIGHTFORWARD CONDITIONAL PROBABILITY! I'VE POSTED THIS TWICE ALREADY AND BOTH TIMES I RECEIVED AN ANSWER OF 1. THIS IS INCORRECT!

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