200 students note the time, $t$ minutes, taken for their trip from home to school. The cumulative frequency diagram presents the results.
(a(i))[1]
Determine the median.
(a(ii))[1]
Determine the lower quartile.
(a(iii))[1]
Determine the inter-quartile range.
(a(iv))[1]
Determine the 15th percentile.
(a(v))[2]
Determine the number of students whose journey time was more than 30 minutes.
(b(i))[4]
Calculate an estimate for the mean.
(b(ii))[4]
Use the grid to finish the histogram so that it represents the information in the frequency table.
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