O-LevelMathematicsStatistics4024/11 · May/June 2015 · Q143 Marks

A pie chart is used to illustrate the numbers of adults, girls and boys in a group of people. The angles for the adults and girls are 80° and 120° respectively. The diagram shows part of the pie chart. [Figure 14]

(a)Complete the pie chart.[1]
(b)Express the ratio of numbers of adults : girls : boys in the form a : b : c, where a, b and c are the smallest possible whole numbers.[1]
(c)There are 6 more girls than adults. Calculate the number of people in the whole group.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

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Topic: Statistics, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source: O-Level Mathematics, May/June 2015 Paper 1 Variant 1, question 14.

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