A New Extended-Life Light Bulb Has an Average Service Life

question 112

Multiple Choice

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?

• A) 95%
• B) 68%
• C) 34%
• D) 99.7%

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Definitions:

Homo Erectus

An extinct species of human that lived approximately 2 million to 100,000 years ago, known for its upright walking ability.

Abstract Modifications

Conceptual changes or adjustments in the way ideas or objects are represented, often used to innovate or solve problems in various fields.

Homo Naledi

An extinct species of human discovered in South Africa, known for its combination of primitive and modern traits.

Clade

A group of organisms believed to comprise all the evolutionary descendants of a common ancestor.