Class Frequency ------ 100–110 8 110–120 14 120–130 20 130–140 10 140–150 8 (Classes are continuous: a –b means a le x < b.) The mean of this distribution is:

  1. 125.5
  2. 125
  3. 124.33
  4. 129.33
Answer

C) 124.33

Using midpoints x: sum fx = 7460, sum f = 60, so barx = sum fxsum f = 124.33. SLO M-09-C-02 · Understanding

Mathematics MCQ · More Measures of Central Tendency MCQs · Practise