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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 35

The operating time of a component is normally distributed with known standard deviation 10 hours. A manufacturer claims that the population mean is 120 hours. A lower-tailed test is to use random samples of 25 components at the 2.5% significance level.

a.

Find the critical value for the sample mean.

[4]
b.

A sample has mean 116.4 hours. Complete the test in context.

[3]
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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