3 The table gives information about the money, £\(A\), some people spent on an internet site one day.
Money spent (£\(A\))
Frequency
\(0 \lt A \leqslant 20\)
10
\(20 \lt A \leqslant 40\)
15
\(40 \lt A \leqslant 60\)
25
\(60 \lt A \leqslant 80\)
40
\(80 \lt A \leqslant 100\)
6
(a) On the grid, draw a frequency polygon for this information.(2)
(b) Write down the modal class interval. (1)
Mark scheme (a)
Answer
Mark
Notes
Frequency polygon
2
B2 correct frequency polygon (B1 for points plotted correctly but not joined OR for points plotted at the correct heights, consistently placed within the class intervals (including ends) and joined OR for an otherwise correct frequency polygon with one point incorrect OR correct frequency polygon with first and last points joined directly)
NB: ignore parts of graph drawn to the left of the 1st point or the right of the last point; ignore any histograms drawn.
