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2.4 N: Statistical distributions

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Question 168

The mass of a high-precision turbine blade, M M\,M grams, is modeled by a normal distribution with a mean of 450.5 g and a standard deviation of 1.8 g. A quality control engineer selects a random sample of 20 blades from a large production batch. Determine the probability that the mean mass of these 20 blades, Mˉ\bar{M}Mˉ, is greater than 451.2 g.

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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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