The mark scheme image I have attached is for a question where you had to draw a cumulative frequency graph and find the IQR from the curve you have drawn. The mark scheme says that if "4 or 5" of the points are correct then award 1 mark. If I got 4 out of the 5 correct, I know I would get 1 mark out of 2. For part d) if I got the IQR correct according to MY graph but not according to the mark scheme, would I get 1 mark or 2. The mark scheme says "dep on graph" so I am guessing this means that if I get the IQR right according to my graph, then I would get 3 out of the 4 marks for parts c) and d). Am I right in thinking this?
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