A machine produces metal rods whose lengths, LLL, follow a normal distribution. It is found that 15% of the rods have a length less than 15.2 cm and 10% of the rods have a length greater than 16.5 cm.
Find the mean and standard deviation of the rod lengths.
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.