ECZ 2020 · GCE Paper 1 — Probability
The probability of a girl not wearing a neck tie is 0.55. What is the probability that the same girl will wear a neck tie?
- A. 0.55
- B. 1.55
- C. 0.275
- D. 0.45
Verified working — step 1
"Wearing" and "not wearing" are opposite events - exactly one happens - so their probabilities add up to 1.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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