O-LevelMathematicsStatistics4024/12 · Oct/Nov 2021 · Q133 Marks

The mean of five numbers is 17. The numbers are listed in order of size, starting with the smallest. The three smallest numbers are equal. The middle three numbers add to 35. The largest number is four times the smallest number. List the five numbers in order of size.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.

[3] 10, 10, 10, 15, 40
M1 for 5 × 17 soi
M1 for their largest = 4 × their smallest or if their middle three values sum to 35 or if their three smallest values are equal

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Topic: Statistics, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source: O-Level Mathematics, Oct/Nov 2021 Paper 1 Variant 2, question 13.

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