ECZ · Paper 1 — Statistics
The cumulative frequency curve shows the ages of the 80 members of a club. Use the curve to estimate the interquartile range of the ages.
- A. 10 years
- B. 20 years
- C. 25 years
- D. 45 years
Verified working — step 1
The lower quartile is read at a cumulative frequency of a quarter of 80, which is 20, giving 25 years. The upper quartile is read at three quarters of 80, which is 60, giving 45 years. The interquartile range is 45 − 25 = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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