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Wendall's Wires sells copper wiring. Suppose in a spool of 500 feet, an average of 1.8 feet is bad wiring with a population standard deviation

Wendall's Wires sells copper wiring. Suppose in a spool of 500 feet, an average of 1.8 feet is bad wiring with a population standard deviation of 0.3 feet. Wendall calculates he can afford to replace up to 25% of the spools sold. What length of bad wiring, to the appropriate tenth of a foot, should trigger the warranty?

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