Given the scores: 4, 7, 8, 11, 13, 8 with corresponding frequencies: 3, 5, 2,…

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Mathematics JAMB 2001

Given the scores: 4, 7, 8, 11, 13, 8 with corresponding frequencies: 3, 5, 2, 7, 2, 1 respectively. The mean score is

  • 7.0
  • 8.7 checkmark
  • 9.5
  • 11.0

The correct answer is: B

Explanation

Mean = ∑fx/∑f
Mean = (4x3) + (7x5) + ... + (8x1) all divided by 20
Mean = 174/20 = 8.7

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