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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 74

The CO emission x x\,x g/km of each of 150 petrol cars is recorded. For these cars,

∑x=33\sum x = 33∑x=33 and ∑x2=7.8\sum x^2 = 7.8∑x2=7.8

For a sample of diesel cars, the CO emissions have mean 0.15 g/km and standard deviation 0.04 g/km.

a.

Calculate the mean CO emission of the 150 petrol cars.

[1]
b.

Calculate the standard deviation of the CO emissions of the 150 petrol cars.

[2]
c.

Compare the CO emissions of the petrol cars and the diesel cars.

[2]
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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