ECZ 2017 · GCE Paper 1 — Sequences and Series
If the arithmetic mean of 5 and c is 11, what is the value of c?
- A. 17
- B. 6
- C. 27
- D. 8
Verified working — step 1
The arithmetic mean of two numbers is their sum halved - so work BACKWARDS from the mean to the sum.The full step-by-step working and final answer, plus the video lesson for this topic, 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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