Mathematics 0580 · IGCSE · Averages and measures of spread

Averages and measures of spread — practice question

The mean value of nine numbers is 17. Seven of these numbers have a total of 132. The remaining two numbers are 5 apart.
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Find the pair of numbers that differ by 5.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Method used: $\dfrac{9\times17-132}{2}$” …

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