The histogram shows information about the speed of cars passing a checkpoint.

40 cars have a speed between 40 and 50 mph.
Work out an estimate for the number of cars which have a speed of more than 65 mph.
Explain why your answer to part a is only an estimate.
Practise OCR GCSE Maths Histograms with exam-style questions for Foundation and Higher tier. 28 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.