(i)[3]
Draw a cumulative frequency graph, with a scale of $2\,\text{cm}$ to $100$ pupils on the horizontal axis and a scale of $2\,\text{cm}$ to $1000$ schools on the vertical axis. Use the graph to estimate the median number of pupils in a school.
(ii)[2]
$80\%$ of the schools have more than $n$ pupils. Estimate the value of $n$, correct to the nearest ten.
(iii)[1]
Find the number of schools with between $201$ and $250$ pupils inclusive.
(iv)[4]
Calculate an estimate for the mean number of pupils per school.