The table gives information about the ages, in years, of 80 people in a train carriage. (a) Complete the cumulative frequency table. (1) (b) On the grid opposite, draw a cumulative frequency graph for your table. (2) (c) Use your graph to find an estimate for the median age of the 80 people. years (1) Of the people in the train carriage, $$\(60 \%\)$$ of those who are aged between 18 and 65 are going to work. None of the other people in the train carriage are going to work. (d) Use your graph to find an estimate for the number of people in the train carriage who are going to work. (3)

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