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JAMB Mathematics 2010 Question 47

Question 47

Measures of Central Tendency

Marks: 1, 2, 3, 4, 5
Frequencies: 2, 2, 8, 4, 4
The table above shows the marks obtained in a given test. Find the mean mark.

  1. A.3.2
  2. B.3.0
  3. C.3.1
  4. D.3.3
Show the answer and explanation

Answer: D (3.3)

Explanation

Σfx = 2 + 4 + 24 + 16 + 20 = 66 and Σf = 20, so the mean is 66/20 = 3.3.