The Lengths of Screws Produced by a Machine Are Normally

question 106

Multiple Choice

The lengths of screws produced by a machine are normally distributed with a mean of 3 inches and a standard deviation of .2 inches. Therefore, we know:

• A) that approximately 68 percent of all screws have lengths between 2.8 and 3.2 inches
• B) that approximately 95 percent of all screws have lengths between 2.8 and 3.2 inches
• C) that just about all screws have lengths between 2.8 and 3.2 inches
• D) that approximately 98 percent of all screws have lengths between 2.8 and 3.2 inches
• E) none of these

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