JAMB Mathematics 2007 Objective — Question 50
Question 50 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2007 Objective paper, with the correct answer and a full explanation.
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Age (years): 10, 11, 12; No. of pupils: 6, 27, 7. The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?
- A. 17/20Correct
- B. 17/40
- C. 20/40
- D. 7/40
Explanation
Total pupils = 6+27+7 = 40. Pupils at least 11 years old = 27+7 = 34. Probability = 34/40 = 17/20.
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