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Determine $\Sigma x$ and $\Sigma x^2$.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
The money amounts, $x$ dollars, that the 24 people had in their pockets are summarised by $\Sigma(x - 36) = -60$ and $\Sigma(x - 36)^2 = 227.76$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “After expanding the brackets, obtain $\sum x = 36$, then subtract $60$.” …
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