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

question 71

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

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Definitions:

Nominal Wage

The wage paid to employees in current dollars, without adjustment for inflation, reflecting the actual amount of money received.

Fisher Effect

Refers to the economic theory that real interest rates are independent of monetary measures, with any increase in expected inflation being matched by an equal increase in nominal interest rates over the long term.

Nominal Interest Rates

The interest rate before adjusting for inflation, representing the face value of interest paid or received.

Real Interest Rates

The interest rate that has been adjusted to remove the effects of inflation, reflecting the true cost of borrowing.