The Expected (Mean)life of a Particular Type of Light Bulb

question 12

Multiple Choice

The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours.The life of this bulb is normally distributed.Which most closely reflects the probability that a randomly selected bulb would last fewer than 1100 hours?

• A)0.4772
• B)0.9772
• C)0.0228
• D)0.5228
• E)0.5513

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Definitions:

Labor

The human effort, including both physical and mental, used in the production of goods and services.

Leisure

Time free from work or duties, often used for relaxation, hobbies, or other personal activities.

Nonlabor Income

Income received that does not originate from employment or working, such as dividends, interest, or rental income.

Wage Rate

The fixed amount of compensation or payment given to an employee by an employer in return for work performed, typically expressed on an hourly, daily, or piecework basis.