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JAMB Mathematics 2009 Question 50

Question 50

Probability

Marks: 2, 3, 4, 5, 6, 7, 8, 9
No. of students: 3, 4, 1, 0, 4, 5, 2, 1
The table above shows the distribution of marks of students in a test. Find the probability of passing the test if the pass mark is 5.

  1. A.3/5
  2. B.4/9
  3. C.7/20
  4. D.1/5
Show the answer and explanation

Answer: A (3/5)

Explanation

There are 20 students and 0 + 4 + 5 + 2 + 1 = 12 scored 5 or more, so the probability is 12/20 = 3/5.