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JAMB Mathematics 1986 Question 2

Question 2

Measures of Central Tendency

If Musa scored 75 in Biology instead of 57, his average mark in four subjects would have been 60. What was his total mark?

  1. A.282
  2. B.240
  3. C.222
  4. D.210.
Show the answer and explanation

Answer: C (222)

Explanation

With 75 his total would be 4 × 60 = 240. He actually scored 18 less in Biology, so his total is 240 − 18 = 222.