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JAMB Mathematics 2009 Question 45

Question 45

Measures of Central Tendency

5, 8, 6 and k occur with frequencies 3, 2, 4 and 1 respectively and have a mean of 5.7. Find the value of k.

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

Answer: C (2)

Explanation

(15 + 16 + 24 + k)/10 = 5.7 gives 55 + k = 57, so k = 2.