Foundation November 2019 Paper 2 Q21
21 The table shows some information about the weights of 50 potatoes.
| Weight (\(w\) grams) | Frequency |
|---|---|
| \(10 \lt w \leqslant 20\) | 6 |
| \(20 \lt w \leqslant 30\) | 21 |
| \(30 \lt w \leqslant 40\) | 13 |
| \(40 \lt w \leqslant 50\) | 7 |
| \(50 \lt w \leqslant 60\) | 3 |
Iveta drew this frequency polygon for the information in the table.
The frequency polygon is not fully correct.
Write down two things that are wrong with the frequency polygon. (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| Two statements | C2 | Two different statements Acceptable There is no ‘frequency’ label / \(y\)-axis is not labelled / no title for the \(y\)-axis The polygon should not be closed / have a line at the bottom / have first and last points connected (15, 6) has been plotted incorrectly / at (15, 8) / (The first point is at) 8 rather than 6 / First point is on an incorrect frequency Not acceptable There is no title / Points should be joined with a curve \(x\)-axis doesn’t start at 0 There is no label The axes have not been labelled (\(x\) and \(y\)) The points haven’t (all) been plotted correctly \(10 \lt w \leqslant 20\) and \(30 \lt w \leqslant 40\) have been plotted wrong The first point is plotted incorrectly, its at (15, 7) not (15, 6) The points have been joined up wrong / Points should not be joined in the shape of a triangle / They’ve connected all the points Done the midpoints rather than the numbers on the right side / The points are in the middle |
| (C1 | for one statement eg from those above) |
Additional guidance
Ignore additional statements provided no contradiction