(a(i))[1]
Write down the modal class.
(a(ii))[2]
At the science fair, $90$ people were over $30$. Calculate how many people were aged $16$ to $20$.
(b(i))[3]
Complete the histogram so that it shows this data.
(b(ii))[2]
Students who scored $75$ or more are awarded a distinction. Find an estimate for the percentage of the $250$ students who gained a distinction.