On any day, a machine produces eight items. Each is defective independently with probability 0.25. A binomial model gives the probability of exactly two defective items as 0.311. Over 50 comparable days, estimate the number of days on which exactly two defective items will be produced.
39 exam-style questions on CCEA A Level Maths 2.7 Statistical distributions, covering 2.7.1 Statistical distributions and 2.7.2 Statistical distributions. Each one has a worked solution and a mark scheme showing where the marks go.