Requests for online help at a website chat follow a Poisson distribution with a mean rate of 0.2 requests per second. Find the following: a. The probability that there are no requests for help during a one second interval. Does the size of the probability make sense? Explain. b. The probability that there are between 2 and 3 requests (inclusive) during a 5 second interval. c. The mean and standard deviation for the number of requests in a five second interval.

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