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

question 73

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. What is the probability that a randomly selected bulb would last fewer than 940 hours?

• A) 0.3849
• B) 0.8849
• C) 0.1151
• D) 0.6151
• E) 0.6563

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Definitions:

Postindustrial Society

A society economically dependent upon the production and distribution of services, information, and knowledge.

Agricultural Society

A society that relies on farming and cultivation of the land as the primary source of livelihood and economic activity.

Industrial Society

A society characterized by a reliance on mechanized labor to create goods, leading to urbanization and changes in social structures.

Achieved Status

A status attained by effort.