The Mean Length of Time, Per Week, That Students at a Certain

question 17

Multiple Choice

The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard deviation of 1.4 hours. Assuming the distribution of study times is normal, what percent of students study between 22.9 and 25.7 hours?

• A) 99.7%
• B) 95%
• C) 68%
• D) 50%

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Definitions:

Verb Agree

The grammatical principle that verbs must match their subjects in number and person, essential for correct sentence structure.

Subject

The person or thing that is being discussed, described, or dealt with.

Fifteen Dollars

A specified amount of currency, equal to 15 units of the United States dollar.

Subject

The part of a sentence or clause that indicates whom or what the sentence is about, usually performing the action of the verb.