A survey of 500 households in Jakarta found that 85 households have three or more cars. Using this data, estimate how many households in a city of 200,000 households would have three or more cars.

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Question

A survey of 500 households in Jakarta found that 85 households have three or more cars. Using this data, estimate how many households in a city of 200,000 households would have three or more cars.

Accepted Answer

34,000 — Award 1 mark for relative frequency = 85/500 = 0.17, then expected number = 0.17 × 200,000 = 34,000. A is incorrect — this multiplies 85 by 200. C is incorrect — this is 85/500 × 250,000. D is incorrect — this assumes 85% rather than 85/500.

Answer

34,000

Answer

17,000

Answer

42,500

Answer

85,000

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