How many pounds of candy that sells for $0.82 per lb must be mixed with candy that sells for $1.33 per lb to obtain 7 lb of a mixture that should sell for $0.95 per lb?

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Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

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