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:

Handedness

The preference for using one hand over the other for performing activities, usually categorized as right-handed, left-handed, or ambidextrous.

No Hand Preference

The absence of a strong preference for the use of one hand over the other, uncommon in the general population.

Emotional Development

The process through which individuals learn to recognize, understand, express, and manage their emotions and to respond appropriately to the emotions of others.

Gross Motor Skills

Physical abilities that involve the large muscles of the body, such as walking, jumping, and throwing.