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4.5 Statistical distributions (A-level only)

4.5 Statistical distributions (A-level only)

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Question 43

The scores on a standardised aptitude test are assumed to follow a normal distribution with a mean of 50 and a standard deviation of 8.

a.

Using this model, find the probability that a randomly chosen candidate scores more than 65.

[1]
b.

A researcher claims that the mean score of candidates from a specific region is higher than 50. A random sample of 64 candidates from this region has a mean score of 52. Test the researcher's claim at the 5% level of significance. You should state your hypotheses clearly.

[4]
Markscheme

4.5 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.5 Statistical distributions (A-level only)

284 exam-style questions on CCEA A Level Maths 4.5 Statistical distributions (A-level only), covering 4.5.1 Statistical distributions (A-level only) and 4.5.2 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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