The probability of Harry being late for school on any day is 0.1. Assume that whether Harry is late on one day is independent of whether he is late on any other day. Over a term of 30 days verify that the probability that Harry is late:
Exactly once is 0.141 (to 3 significant figures)
More than four times is 0.175 (to 3 significant figures)
Less than three times is 0.411 (to 3 significant figures)
215 exam-style questions on Edexcel A Level Maths Statistical Distributions, covering 6.1 Probability Distributions, 6.2 The Binomial Distribution, and 6.3 Cumulative Probabilities. Each one has a worked solution and a mark scheme showing where the marks go.