Find the indicated probability. An urn consists of 20 red balls and 30 green balls. We choose 10 balls at random from the urn. the sampling is done with replacement. a. What is the probability there will be exactly 4 red balls among the chosen balls? b. At a particular car dealership showroom, on average, 2 customers arrive each hour. During a 3-hour time interval, find the probability that at least 5 customers arrive at the showroom.

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