(a(i))[1]
Use the cumulative frequency diagram to estimate the median.
(a(ii))[2]
Use the cumulative frequency diagram to estimate the interquartile range.
(a(iii))[1]
Use the cumulative frequency diagram to estimate the 20th percentile.
(a(iv))[2]
Use the cumulative frequency diagram to find how many girls took more than 66 seconds to solve the problem.
(b(i))[2]
Use the cumulative frequency diagram to complete the frequency table.
(b(ii))[4]
Calculate an estimate for the mean time.
(c(i))[1]
State the percentage of boys who took 66 seconds or less.
(c(ii))[2]
Explain why Howard is wrong.