Practise OCR A Level Maths 2.4.6 Probabilities using the normal distribution (A-level only) with exam-style questions for A Level Maths. 149 questions, matched to the OCR A Level Maths (H240) specification and written in Paper 1, Paper 2 and Paper 3 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.