I have 500 potential customers who come to my candy store each day. Seventy percent of the

Question:

I have 500 potential customers who come to my candy store each day. Seventy percent of the customers buy no pieces of candy, 15 percent buy one piece, 10 percent buy two pieces, and 5 percent buy three pieces. What is the chance that I sell at least 280 pieces of candy in a day?

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