13. The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical,

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 1.     The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?

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13.0 and 15.0 inches

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13.9 and 14.1 inches

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13.8 and 14.2 inches

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13.5 and 14.5 inches

 
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