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WAEC Further Mathematics 2015 Question 25

Question 25

Statistics

The table shows the distribution of marks scored by students in a test.
Marks: 0, 1, 2, 3, 4, 5
No. of candidates: 6, 4, 8, 10, 9, 3
Find the inter-quartile range of the distribution.

  1. A.4
  2. B.3
  3. C.2
  4. D.1
Show the answer and explanation

Answer: B (3)

Explanation

The lower quartile (10th mark) is 1 and the upper quartile (30th mark) is 4, so the inter-quartile range is 4 − 1 = 3.