11 (a) Six hundred candidates took a mathematics examination which consisted of two papers. Each paper was marked out of 100. The diagram shows, on the same grid, the cumulative frequency curves for Paper 1 and Paper 2. (i) Use the cumulative frequency curve for Paper 1 to find an estimate of (a) the median, (b) the interquartile range, (c) the number of candidates who scored more than 45. (ii) A candidate scored 60 on Paper 1. Using both graphs, estimate this candidate’s mark on Paper 2. (iii) State, with a reason, which you think was the more difficult paper.