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2.2.3 Central tendency, variation and standard deviation

2.2.3 Central tendency, variation and standard deviation

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Question 6

A first sample of 30 values has mean 20 and standard deviation 5.

A second sample of 20 values is combined with the first. The 50 values together have mean 22 and standard deviation 6.

a.

Find the mean of the second sample.

[3]
b.

Find the standard deviation of the second sample.

[3]
Markscheme

2.2.3 Central tendency, variation and standard deviation Questions

  1. A Level
  2. /Maths
  3. /2.2.3 Central tendency, variation and standard deviation

39 exam-style questions on AQA A Level Maths 2.2.3 Central tendency, variation and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.

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