Video lessons for OCR (MEI) A Level Maths 2.5.10 Correlation as closeness to a straight line (A-level only). 1 lesson matched to the OCR (MEI) A Level Maths (H640) specification, each working through the content and then applying it to exam-style questions in Component 01, Component 02 and Component 03 format. Suitable for A Level Maths.