The discrete random variable X X\,X has the probability distribution given in the table below, where a a\,a is a constant.
| xxx | 0 | 1 | 2 | 3 |
|---|---|---|---|---|
| P(X=x)P(X = x)P(X=x) | 0.2 | 0.3 | 0.25 | aaa |
Find the value of aaa.
Find P(X>1.2)P(X > 1.2)P(X>1.2).
Construct a table for the cumulative distribution function F(x)F(x)F(x).
390 exam-style questions on AQA A Level Maths 2.4 N: Statistical distributions, covering 2.4.1 Discrete distributions and the binomial, 2.4.2 The Normal distribution (A-level only), and 2.4.3 Selecting an appropriate distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.