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Mathematics

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Researchers studied the relationship between how long a person uses a computer before bed and how long a person sleeps each night. People were selected at random to participate in the study. The computer use of each participant was classified as minimal, moderate, or extreme. The relative frequency table below summarizes the results of this study. There were 17 people in the study who were both moderate computer users and got 5 to 7 hours of sleep. How many people in this study were both extreme computer users and got 5 to 7 hours of sleep?

Answer :

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Answer:

Since moderate user got 5 to 7 hours of sleep, that means extreme users got less than 7 hours of sleep.

Hence no extreme user had 5 to 7 hours of sleep.

And mimimal users had greater than 7 hours of sleep.

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Answer:

1)20

2) D and E

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