The 100m race times an athlete records are normally distributed. 16% of the time the athlete is faster than 10 seconds. 23% of the time the athlete is slower than 11 seconds.
Find the mean and standard deviation of the times.
351 exam-style questions on AQA A Level Maths 2.4.2 The Normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.