Information and IdeasMediumComputing a difference from data
Information and Ideas practice question
A survey reported average daily screen time by age group.
Ages 8 to 12: 4.4 hours
Ages 13 to 18: 7.2 hours
Which choice most accurately completes the statement based on the data? On average, the older group's daily screen time exceeds the younger group's by ____
- A. 2.8 hours.Correct
- B. 11.6 hours.
- C. 1.6 hours.
- D. 3.2 hours.
Answer: A. 2.8 hours.
The difference is 7.2 − 4.4 = 2.8 hours.
Why the other answers are wrong
- B. 11.6 hours.
- 11.6 is the SUM of the two averages, not the difference.
- C. 1.6 hours.
- 1.6 is a subtraction error; 7.2 − 4.4 is 2.8.
- D. 3.2 hours.
- 3.2 would be 7.6 − 4.4. The older group's figure is 7.2.
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