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2.2.12 Variance and standard deviation

2.2.12 Variance and standard deviation

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Question 3

The times, in seconds, taken by 12 athletes to run 400 m are

45.2,46.9,46.1,46.2,45.4,45.1,47.8,45.4,45.5,46.1,46.4,45.745.2,46.9,46.1,46.2,45.4,45.1,47.8,45.4,45.5,46.1,46.4,45.745.2,46.9,46.1,46.2,45.4,45.1,47.8,45.4,45.5,46.1,46.4,45.7.

a.

Find the mean.

[2]
b.

Find the sample standard deviation.

[3]
c.

Find the median and quartiles.

[3]
Markscheme

2.2.12 Variance and standard deviation Questions

  1. A Level
  2. /Maths
  3. /2.2.12 Variance and standard deviation

8 exam-style questions on OCR (MEI) A Level Maths 2.2.12 Variance and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.

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