A line of best fit for revision time against test score passes through (2 hours, 30 marks) and (6 hours, 70 marks). Estimate the mark for 4 hours of revision.

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Question

A line of best fit for revision time against test score passes through (2 hours, 30 marks) and (6 hours, 70 marks). Estimate the mark for 4 hours of revision.

Accepted Answer

50 marks — Award 1 mark. The line rises 40 marks over 4 hours, a gradient of 10 marks per hour, so 4 hours gives 30 + 2 × 10 = 50 marks. Halving the mark range without using the gradient gives 40 and ignores the starting value.

Answer

60 marks

Answer

40 marks

Answer

45 marks

Answer

50 marks

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