(main)[3]
Determine the variance of these $50$ values.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
The 50 observations of $x$ are represented by $\sum (x - 20) = 35$ and $\sum x^2 = 25\,036$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Right value for $\sum x$ or $\bar{x}$, for example $\sum x=1035$ or $\bar{x}=20.7$” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI