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

  • A 7.0
  • B 8.7
  • C 9.5
  • D 11.0
jamb 2001mathematics

The correct answer is B. 8.7

The mean is calculated by summing all the values in the data set and dividing by the number of values. In this case, the sum of the values is (4 x 3) + (7 x 5) + (8 x 2) + (11 x 7) + (13 x 2) + (8 x 1) = 12 + 35 + 16 + 77 + 26 + 8 = 174.

The total number of values is 3 + 5 + 2 + 7 + 2 + 1 = 20.

Therefore, the mean score is 174 / 20 = 8.7

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