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

question 71

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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