Information and IdeasVery hardChoosing the correct rate comparison
Information and Ideas practice question
Two ferries last summer:
Ferry X: 400 crossings, 12 cancelled
Ferry Y: 250 crossings, 10 cancelled
A travel writer claims that Ferry X was more reliable than Ferry Y. Which choice most effectively uses data from the table to support the claim?
- A. Ferry X cancelled 3% of its crossings (12 of 400), compared with 4% for Ferry Y (10 of 250).Correct
- B. Ferry X made more crossings than Ferry Y.
- C. Ferry Y cancelled fewer crossings than Ferry X.
- D. Ferry X cancelled 12 crossings.
Answer: A. Ferry X cancelled 3% of its crossings (12 of 400), compared with 4% for Ferry Y (10 of 250).
Reliability is the cancellation rate; choice A computes both rates.
Why the other answers are wrong
- B. Ferry X made more crossings than Ferry Y.
- Volume alone doesn't show reliability.
- C. Ferry Y cancelled fewer crossings than Ferry X.
- Fewer cancellations from fewer crossings; the rate favours X, and this points the wrong way.
- D. Ferry X cancelled 12 crossings.
- A count without a rate or comparison.
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