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WAEC Further Mathematics 2021 Question 40

Question 40

Statistics

The table shows the distribution of marks obtained by some students in a test.
Marks: 0−9, 10−19, 20−29, 30−39, 40−49
Frequency: 4, 12, 16, 6, 2
Find the modal class mark.

  1. A.4.5
  2. B.14.5
  3. C.24.5
  4. D.34.5
Show the answer and explanation

Answer: C (24.5)

Explanation

The modal class is 20−29 (frequency 16); its class mark is (20 + 29)/2 = 24.5.