A variable x x\,x was measured to the nearest whole number. 50 observations are given in the table below.
| xxx | 5–8 | 9–13 | 14–20 | 21–24 |
|---|---|---|---|---|
| Frequency | 8 | 10 | 21 | 11 |
A histogram was drawn and the bar representing the 9–13 class has a width of 2 cm and a height of 3 cm.
Find the frequency density for the 9–13 class.
Find the width and height of the bar representing the 14–20 class.
160 exam-style questions on Edexcel A Level Maths Representations of Data, covering 3.1 Outliers, 3.2 Box Plots, 3.3 Cumulative Frequency, 3.4 Histograms, and 3.5 Comparing Data. Each one has a worked solution and a mark scheme showing where the marks go.