The weights of sugar bags produced in a factory are normally distributed. 8% of the bags weigh less than 490 g. 12% of the bags weigh more than 510 g.
Find the mean and standard deviation of the weights of the sugar bags.
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.