The mass of newborn kittens in a specific breed is normally distributed.
20% of the kittens have a mass of less than 85 grams. 12% of the kittens have a mass of more than 115 grams.
Find the mean and standard deviation of the masses.
48 exam-style questions on Edexcel A Level Maths 3.5 Finding the mean and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.