An Accelerated Life Test on a Large Number of Type-D

question 62

Multiple Choice

An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.2 hours. About 95.44 percent of the batteries failed between what two values?

• A) 8.9 and 18.9
• B) 12.2 and 14.2
• C) 14.1 and 22.1
• D) 16.6 and 21.4
• E) None of the choices are correct

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