On a Physical Fitness Test Middle School Boys Are Awarded

question 43

Multiple Choice

On a physical fitness test middle school boys are awarded one point for each push-up they can do, and a point for each sit-up. National results showed that boys average 18 pushups with a standard deviation of 4 push-ups, and 34 sit-ups with standard deviation 11. The mean of their combined (total) scores was therefore 18 + 34 = 52 points. What is the standard deviation of their combined scores?

• A) It cannot be determined.
• B) 137
• C) 15
• D) 11.7
• E) 5.3

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Definitions:

Pest-resistant

Refers to plants that have developed or been genetically modified to resist pests, reducing the need for chemical pesticides.

Disease-resistant

The ability of an organism to prevent infection or resist the effects of disease-causing pathogens through natural or genetically modified traits.

Chemical Pesticides

Substances used to kill or control the population of pests that can harm crops, animals, and humans, made from synthetic chemicals.

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