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The distribution of a sample of the outside diameters of PVC gas pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 19.0 inches, and

The distribution of a sample of the outside diameters of PVC gas pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 19.0 inches, and the standard deviation is 2.0 inches. About 68 percent of the outside diameters lie between what two amounts?

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