The Distribution of a Sample of the Outside Diameters of PVC

question 32

Multiple Choice

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

• A) 13.5 and 14.5 cm
• B) 13.0 and 15.0 cm
• C) 13.9 and 14.1 cm
• D) 13.8 and 14.2 cm

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