You have invited 100 guests to a party. You need to arrange for coffee for the guests. You believe that a guest might need 0, 1 or 2 cups of coffee with probabilities 1/4, 1/2, and 1/4 respectively. You assume that the number of coffee cups each guest drinks is independent from other guests. How many coffee cups should you arrange so that you are 95% sure that there is no shortage?
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use the highest possibility that is 1/2 of 100 so u need to arrange 50 cups.
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