Chen has this information about the time that it took an operator at a call centre to answer each of 90 calls. Time (seconds) Cumulative frequency 0 < t ≤ 10 4 0 < t ≤ 20 25 0 < t ≤ 30 70 0 < t ≤ 40 88 0 < t ≤ 50 90 Chen draws this cumulative frequency graph for the information in the table. Write down two different things that are wrong with this graph.

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Chen has this information about the time that it took an operator at a call centre to answer each of 90 calls - Edexcel - GCSE Maths - Question 13 - 2022 - Paper 3

Question 13

Chen has this information about the time that it took an operator at a call centre to answer each of 90 calls. Time (seconds) Cumulative frequency 0 < t ≤ 10 4 0 <... show full transcript

Worked Solution & Example Answer:Chen has this information about the time that it took an operator at a call centre to answer each of 90 calls - Edexcel - GCSE Maths - Question 13 - 2022 - Paper 3

Step 1

List one issue with the graph's axis

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Answer

The graph is missing a label on the horizontal axis. This is crucial as it does not indicate what the intervals of time represent.

Step 2

List another issue with the graph's plotting

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Answer

The graph has not been plotted at the top end of the class intervals; it is plotted at midpoints instead. This can lead to misinterpretation of the cumulative frequency.

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