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2.2 L: Data presentation and interpretation

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Question 35

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 L: Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 L: Data presentation and interpretation

244 exam-style questions on AQA A Level Maths 2.2 L: Data presentation and interpretation, covering 2.2.1 Single-variable data diagrams, 2.2.2 Scatter diagrams and correlation, 2.2.3 Central tendency, variation and standard deviation, 2.2.4 Outliers and cleaning data, and 2.2 L: Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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