The frequency density for a class is defined as
$\text{frequency density}=\dfrac{\text{frequency}}{\text{class width}}.$
Show that the frequency density for the $\pounds 10,000$–$\pounds 20,000$ class is $0.0066$.

By reading the histogram, write down the frequency density for the $\pounds 50,000$–$\pounds 90,000$ class.

Hence estimate the number of cars sold in the $\pounds 50,000$–$\pounds 90,000$ class.

Using the axes and scale from the histogram, estimate the frequency in each class and the total number of cars sold. Show your working; you may present your results in a short table.

Using class midpoints together with your class frequencies from part (d), use your GDC to estimate the mean sale price (to the nearest $\pounds 100$).

Comment on the skewness of the distribution, giving a reason from the histogram.