Class Frequency ------ 40–50 3 50–60 12 60–70 15 70–80 6 80–90 4 (Classes are continuous: a –b means a le x < b.) The mean of this distribution is:

  1. 65
  2. 64
  3. 69
  4. 64.83
Answer

B) 64

Using midpoints x: sum fx = 2560, sum f = 40, so barx = sum fxsum f = 64. SLO M-09-C-02 · Understanding

Mathematics MCQ · More Measures of Central Tendency MCQs · Practise