The Distribution of a Sample of the Outside Diameters of PVC

question 47

Multiple Choice

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?

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

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