Mathematics 9709 · AS & A Level · Sampling and estimation

Sampling and estimation — practice question

For 10 values of $x$, the mean is $86.2$ and $\sum (x - a) = 362$.
(i)[1]

Find the value of $\sum x$.

(ii)[2]

Find the value of the constant $a$.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “State the correct value, $\sum x = 862$.” …

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