ECZ · Paper 1 — Statistics
The cumulative frequency curve shows the ages of the 80 members of a club. Use the curve to estimate the number of members who are older than 50 years.
- A. 12
- B. 20
- C. 68
- D. 80
Verified working — step 1
Reading up from 50 years to the curve gives a cumulative frequency of 68, which is the number aged 50 or less. The number older than 50 is therefore 80 − 68 = …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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