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An interactive computer system is available at a large installation. Let X denote the number of requests for this system received per hour. Assume that X has a Poisson distribution with parameter As. These data are obtained:

25 20 20

30 24 15

10 23 4

(a) Find an unbiased estimate for Xs.

(b) Find an unbiased estimate for the average number of requests received per hour.

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