X∼Bin(20,0.3)X\sim\mathrm{Bin}(20,0.3)X∼Bin(20,0.3).
Find P(4≤X≤7)P(4\leq X\leq7)P(4≤X≤7).
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.