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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 136

For an extract of 150 petrol cars from the Large Data Set, the CO emission x x\,x g/km of each car is recorded. It is given that

∑x=36\sum x = 36∑x=36 and ∑x2=9.6\sum x^2 = 9.6∑x2=9.6

For an extract of diesel cars from the same data set, the mean CO emission is 0.15 g/km and the standard deviation is 0.05 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 in these two extracts.

[1]
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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