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WAEC Further Mathematics 2014 Question 18

Question 18

Statistics

The table shows the distribution of ages of members of a cultural Troupe.
Age (years): 10 − 14, 15 − 19, 20 − 24, 25 − 29, 30 − 34
Frequency: 6, 8, 14, 10, 12
What is the class-mark of the median class?

  1. A.19
  2. B.22
  3. C.24
  4. D.32
Show the answer and explanation

Answer: B (22)

Explanation

There are 50 members; the 25th lies in 20 − 24 (cumulative 6, 14, 28). Its class mark is 22.