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4.2 Statistical distributions (A-level only)

4.2 Statistical distributions (A-level only)

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Question 11

The time taken for a pizza delivery is normally distributed with a mean of 28 minutes. It is found that 15% of deliveries take longer than 35 minutes.

Find the standard deviation of the pizza delivery times.

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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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