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WAEC Mathematics 1988 Question 7

Question 7

Measures of Central Tendency

A group of students took a test and the following frequency table shows the scores:
Score: 0, 1, 2, 3, 4, 5
Frequency: 2, 3, 4, 2, 7, 2
The median score is

  1. A.0
  2. B.2.5
  3. C.3
  4. D.5
  5. E.7
Show the answer and explanation

Answer: C (3)

Explanation

There are 20 scores, so the median is the average of the 10th and 11th. Cumulative frequencies are 2, 5, 9, 11, …, so both the 10th and 11th scores are 3.