Information and IdeasHardSupporting a claim about a share of a total
Information and Ideas practice question
Sources of a household's electricity use last month (kilowatt-hours):
Heating: 300
Appliances: 150
Lighting: 50
Other: 100
A resident claims that heating accounts for half of the household's electricity use. Which choice most effectively uses data from the table to support the claim?
- A. Heating used 300 of the 600 kilowatt-hours in total, which is 50%.Correct
- B. Heating used 300 kilowatt-hours.
- C. Heating used twice as much as appliances.
- D. Lighting used the least electricity.
Answer: A. Heating used 300 of the 600 kilowatt-hours in total, which is 50%.
Half of a total requires the total: 300 of 600.
Why the other answers are wrong
- B. Heating used 300 kilowatt-hours.
- A figure without the total can't show a share.
- C. Heating used twice as much as appliances.
- A comparison with one category, not the whole.
- D. Lighting used the least electricity.
- Irrelevant to heating's share.
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