A variable X X\,X is normally distributed with a standard deviation of 1.8. Given P(X<25)=0.22P(X < 25) = 0.22P(X<25)=0.22, find the mean of XXX.
Practise Edexcel A Level Maths The Normal Distribution with exam-style questions for A Level Maths. 439 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.