An urban transport survey finds that 22% of commuters in a specific metropolitan area utilize a bike-sharing application for their daily travel.
A random sample of 45 commuters is selected. Determine the probability that at most 8 of these commuters utilize the bike-sharing application.
A second, larger random sample of 250 commuters is selected. Using a normal approximation, estimate the probability that the number of commuters in this sample who utilize the bike-sharing application is fewer than 50.
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.