Information and IdeasHardSupporting a per-vehicle comparison
Information and Ideas practice question
Accidents per year and daily traffic on two roads:
Road A: 24 accidents, 12,000 vehicles a day
Road B: 30 accidents, 30,000 vehicles a day
A safety officer claims that Road A is more dangerous per vehicle than Road B. Which choice most effectively uses data from the table to support the claim?
- A. Road A has 2 accidents for every 1,000 daily vehicles (24 ÷ 12), while Road B has 1 for every 1,000 (30 ÷ 30).Correct
- B. Road B has more accidents than Road A.
- C. Road A carries 12,000 vehicles a day.
- D. Both roads have more than 20 accidents a year.
Answer: A. Road A has 2 accidents for every 1,000 daily vehicles (24 ÷ 12), while Road B has 1 for every 1,000 (30 ÷ 30).
The claim is per vehicle; choice A divides accidents by traffic for both roads.
Why the other answers are wrong
- B. Road B has more accidents than Road A.
- Raw accident counts ignore traffic volume — and point the other way.
- C. Road A carries 12,000 vehicles a day.
- Traffic alone, no accidents.
- D. Both roads have more than 20 accidents a year.
- True, but it doesn't compare rates.
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