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

question 10

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 longer than 1150 hours?

• A) 0.4987
• B) 0.9987
• C) 0.0013
• D) 0.5013
• E) 0.5513

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Definitions:

Genes

Units of heredity made up of DNA that encode for the synthesis of proteins, influencing various traits and characteristics of an organism.

DNA

DNA, a molecule responsible for carrying the genetic blueprints essential for the growth, development, functioning, and reproduction of every known living being.

Chromosomes

Structures within cells that contain DNA and carry genetic information, with humans typically having 23 pairs.

Lateralization

The propensity of particular cognitive functions or neural activities to be more pronounced in one hemisphere of the brain than in its counterpart.