Class Frequency ------ 10–20 5 20–30 8 30–40 12 40–50 9 50–60 6 (Classes are continuous: a –b means a le x < b.) The mean of this distribution is:

  1. 40.75
  2. 37.33
  3. 35
  4. 35.75
Answer

D) 35.75

Using midpoints x: sum fx = 1430, sum f = 40, so barx = sum fxsum f = 35.75. SLO M-09-C-02 · Understanding

Mathematics MCQ · More Measures of Central Tendency MCQs · Practise