CIMA BA1 · Chapter 9 · Question 3 of 11
Order sizes have been grouped as follows: 0 to under 10 units: 4 orders 10 to under 20 units: 10 orders 20 to under 30 units: 6 orders Using class midpoints, what is the estimated mean order size?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) 16.0 units
Explanation
Midpoints are 5, 15 and 25. Sum of fx = 5 x 4 + 15 x 10 + 25 x 6 = 20 + 150 + 150 = 320. Total frequency = 20. Mean = 320 / 20 = 16.0 units.
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