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3.1 20 30 40 50 60 70 80 Figure 1 Figure 1 shows part of a box and whisker plot for the marks in an examination with a large number of candidates. Part of the lower whisker has been torn off. (a) Given that 75% of the candidates passed the examination, state the lowest mark for the award of a pass. (1) (b) Given that the top 25% of the candidates achieved a merit grade, state the lowest mark for the award of a merit grade. (1) An outlier is defined as any value greater than c or any value less than d where c= Q3 + 1.5XIQR d= 01 - 1.5XIQR (c) Find the value of c and the value of d. (2) (d) Write down the 3 highest marks scored in the examination. (2) The 3 lowest marks in the examination were 5, 10 and 15. (e) On the diagram below complete the box and whisker plot. (In your solutions make a note of what you would draw, and where. Alternatively, copy out the diagram.) 10 20 30 40 50 60 70 80 (3)