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JAMB Mathematics 2002 Question 50

Question 50

Measures of Central Tendency

No. of days: 1, 2, 3, 4, 5, 6
No. of students: 20, x, 50, 40, 2x, 60
The distribution above shows the number of days a group of 260 students were absent from school in a particular term. How many students were absent for at least four days in the term?

  1. A.210
  2. B.40
  3. C.120
  4. D.160
Show the answer and explanation

Answer: D (160)

Explanation

20 + x + 50 + 40 + 2x + 60 = 260 gives 3x = 90, so x = 30. At least four days: 40 + 60 + 60 = 160 students.