The random variable X X\,X has the distribution X∼B(60,0.25)X \sim B(60, 0.25)X∼B(60,0.25).
a.
Find the mean of XXX.
[1]
b.
Show that the variance of X X\,X is 11.25.
[1]
c.
Find P(X=15)P(X = 15)P(X=15).
[1]
Markscheme
2.4.1 Discrete distributions and the binomial Questions
39 exam-style questions on AQA A Level Maths 2.4.1 Discrete distributions and the binomial. Each one has a worked solution and a mark scheme showing where the marks go.