The battery life, in hours, for a fully charged wireless keyboard is normally distributed with mean 60 hours and standard deviation 8 hours. Hannah has a fully charged wireless keyboard.
Hannah uses her keyboard for 52 hours. Find the probability that Hannah's keyboard lasts for another 12 hours.
616 exam-style questions on Edexcel A Level Maths The Normal Distribution, covering 3.1 The Normal Distribution, 3.2 Finding Probabilities for Normal Distributions, 3.3 The Inverse Normal Distribution Function, 3.4 The Standard Normal Distribution, 3.5 Finding the mean and standard deviation, 3.6 Approximating a Binomial Distribution, and 3.7 Hypothesis Testing with the Normal Distribution. Each one has a worked solution and a mark scheme showing where the marks go.