Light Bulbs Are Normally Distributed with an Average Lifetime of 1000

question 108

Multiple Choice

Light bulbs are normally distributed with an average lifetime of 1000 hours and a standard deviation of 250 hours. The probability that a light bulb picked at random will last less than 1500 hours is about:

• A)97.72 percent.
• B)95.44 percent.
• C)75.00 percent.
• D)68.00 percent.

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Definitions:

Fluorine

A highly reactive, pale yellow gas at room temperature, the most electronegative and reactive of all the elements, used in various industrial and chemical applications.

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Vitamin B12

An essential vitamin important for the normal functioning of the brain and nervous system, and for the formation of blood.

Nitrogen Metabolism

The process by which living organisms process nitrogen, including its assimilation, utilization, and excretion, within their metabolic systems.