18) A

Let the sample size be 100
Between 75 and 85 households own a dishwasher
Between 35 and 40 households own a tumble dryer
Less than 5 households own nothing.

Maximum value = 85 + 40 – 100 = 125 – 100 = 25%
Minimum value = 75 + 35 – 100 = 110 – 100 = 10%

Hence the answer is A (10% – 30%)

2 thoughts on “2012 Section 1 Question 18

    1. Hi,
      Thank you for the comment!

      Actually I made a mistake in my workings
      Mistake: 85 + 40 – 100 = 35%
      Correct working: 85 + 45 – 100 = 25%

      So the correct answer is A (10% – 30%)

      Thank you for bring this to my attention! I have edited the workings now.

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