The weights of a certain variety of apple are normally distributed with a mean of 150 g and a standard deviation of 20 g.
Find the weight below which 85% of these apples fall. Give your answer to the nearest gram.
149 exam-style questions on OCR (MEI) A Level Maths 2.4.12 Calculate probabilities from a Normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.