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JAMB Mathematics 2007 Question 8

Question 8

Measures of Central Tendency

Marks: 3, 4, 5, 6, 7, 8
Frequency: 5, y − 1, y, 9, 4, 1
The table above gives the frequency distribution of marks obtained by a group of students in a test. If the total mark scored is 200, calculate the value of y.

  1. A.15
  2. B.13
  3. C.11
  4. D.9
Show the answer and explanation

Answer: C (11)

Explanation

15 + 4(y − 1) + 5y + 54 + 28 + 8 = 200 gives 9y + 101 = 200, so y = 11.