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4. A door-to-door salesman is selling vacuum cleaners. The probability of making a sale at a randomly chosen house is .06. In one day, he

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4. A door-to-door salesman is selling vacuum cleaners. The probability of making a sale at a randomly chosen house is .06. In one day, he visits 150 houses, and the likelihood of making a sale at a particular house is independent of all the other houses. a) (10 points) What is the expected number of vacumms sold in a day? What is the standard deviation

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