The shelf life of a specific type of fresh bread is normally distributed.
14% of the loaves spoil in fewer than 3 days. 18% of the loaves stay fresh for longer than 7 days.
Find the mean and standard deviation of the shelf life of the bread.
Practise Edexcel A Level Maths Finding the mean and standard deviation with exam-style questions for A Level Maths. 48 questions, matched to the Edexcel A Level Maths (9MA0) 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.
