A company's marketing department claims that the number of orders that are placed using their e-commerce store has a Poisson distribution with mean of 3.5 orders per minute. Let X be the number of orders in 1 minute. Let Y be the number of orders in 5 minutes. If the claim of a mean of 3.5 orders per minute is true a. What is P(X <=3)? b. What is the variance for X? c. What is the mean and standard deviation for Y?

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