(i)[2]
Determine the value of $n$.
(ii)[4]
Determine $\sum x^2$.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
For a set of $n$ values of $x$, the information below was obtained: $\sum(x - 20) = 136$, $\sum(x - 20)^2 = 2888$. The mean of these $n$ values of $x$ is $24.25$.