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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 44

A random sample of size 12 is taken from a population that is normally distributed with mean 82 and standard deviation 5.

a.

State the distribution of the sample mean X‾\overline XX.

[2]
b.

Find P(X‾<80)P(\overline X<80)P(X<80).

[2]
Markscheme

4.2 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.2 Statistical distributions (A-level only)

328 exam-style questions on WJEC A Level Maths 4.2 Statistical distributions (A-level only), covering 4.2.1 Statistical distributions (A-level only), 4.2.2 Statistical distributions (A-level only), and 4.2.3 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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