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2.2 Data presentation and interpretation

2.2 Data presentation and interpretation

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Question 39

The CO emissions of 24 cars have mean 0.25 g/km and standard deviation 0.06 g/km.

A 25th car, with a CO emission of 0.49 g/km, is added to the sample.

a.

Find the mean CO emission of the 25 cars.

[2]
b.

Find the standard deviation of the CO emissions of the 25 cars.

[3]
Markscheme

2.2 Data presentation and interpretation Questions

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

105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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