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2.4 N: Statistical distributions

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Question 31

Scores on a professional certification exam are modeled by a normal distribution.

15% of candidates score lower than 60 marks. 10% of candidates score higher than 85 marks.

Calculate the mean and standard deviation of the scores.

[6]
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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