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JAMB Mathematics 1984 Question 37

Question 37

Data Presentation

The cumulative frequency function of the data below is given by the equation y = cf(x). What is cf(5)?
Scores (n): 3, 4, 5, 6, 8
Frequency (f): 30, 32, 30, 35, 20

  1. A.30
  2. B.35
  3. C.55
  4. D.62
  5. E.92.
Show the answer and explanation

Answer: E (92.)

Explanation

cf(5) counts all scores up to 5: 30 + 32 + 30 = 92.