(a)[1]
Complete the cumulative-frequency table shown below.
(b)[3]
Draw a cumulative frequency curve on the grid below to show this data.
(c(i))[1]
Use your graph to work out an estimate of the median.
(c(ii))[1]
Use your graph to work out the 90th percentile of the distribution.
(d)[3]
Using the grid on the previous page, draw the cumulative frequency curve for garage B.
(e)[3]
Use your graphs to estimate how many of these customers were offered a gift at each garage, then complete the sentence.