A Data Set Has a Mean of 70 and a Standard

question 28

Multiple Choice

A data set has a mean of 70 and a standard deviation of 10. Which of the following might possibly be true?

• A) At least 15% of the data values are less than 40 or greater than 100.
• B) More than 90% of the data values are between 40 and 100.
• C) No more than 50% of the data values are between 50 and 90.
• D) No less than 30% of the data values are less than 50 or greater than 90.

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Definitions:

Crepuscular

Describing organisms that are most active during the twilight periods at dawn and dusk.

Circadian Rhythm

Circadian rhythm refers to the natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.

Long-Term Change

A significant modification or transformation that occurs over an extended period, impacting environments, societies, or biological evolution.

Learning

The process by which knowledge or skills are acquired as a result of experience; a change in the behavior of an animal that results from experience.