Information and IdeasVery hardRecognising that a proportion changed while a count did not
Information and Ideas practice question
A choir's membership:
2015: 40 members, of whom 10 were under 30
2025: 60 members, of whom 10 were under 30
Which statement is best supported by the data?
- A. The number of members under 30 stayed the same, but their share of the choir fell from a quarter to a sixth.Correct
- B. The number of members under 30 fell.
- C. The share of members under 30 rose.
- D. The choir shrank between 2015 and 2025.
Answer: A. The number of members under 30 stayed the same, but their share of the choir fell from a quarter to a sixth.
10 of 40 is 25%; 10 of 60 is about 17%. Same count, smaller share.
Why the other answers are wrong
- B. The number of members under 30 fell.
- The count was 10 both years.
- C. The share of members under 30 rose.
- The share fell.
- D. The choir shrank between 2015 and 2025.
- Membership grew from 40 to 60.
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