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JAMB Mathematics 1990 Question 48

Question 48

Measures of Central Tendency

Below are the scores of a group of students in a test.
Scores: 1, 2, 3, 4, 5, 6
No. of Students: 1, 4, 5, 6, x, 2
If the average score is 3.5, find the value of x.

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

Answer: B (2)

Explanation

Total score = 1 + 8 + 15 + 24 + 5x + 12 = 60 + 5x and the number of students is 18 + x. (60 + 5x)/(18 + x) = 3.5 gives 1.5x = 3, so x = 2.