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2.4 N: Statistical distributions

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Question 17

The random variable X X\,X has the distribution X∼B(12,p)X \sim B(12, p)X∼B(12,p), and P(X=0)=0.0687P(X = 0) = 0.0687P(X=0)=0.0687 to 3 significant figures.

a.

Show that p=0.2p = 0.2p=0.2.

[3]
b.

Hence find P(X≥3)P(X \ge 3)P(X≥3).

[2]
c.

Find the variance of XXX.

[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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