2. Sue baked a batch of chocolate chip cookies. She made 15 trays of cookies with 20 cookies per tray; she used 1500 chocolate chips in the batter. Suppose the number of chips per cookie has a Poisson distribution. Find the probability that a. a cookie chosen at random has at most 4 chocolate chips. b. at least 4 of 7 cookies chosen at random have at most 4 chips. Give numerical answers; if you can't do part a., make necessary assumptions to do part b.

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