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2.4 N: Statistical distributions

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Question 58

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 N: Statistical distributions Questions

  1. A Level
  2. /Maths
  3. /2.4 N: Statistical distributions

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.

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