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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 134

The CO emissions, x x\,x g/km, of 120 petrol cars are summarised in the table below.

CO emission (g/km)Frequency
0.0≤x<0.10.0 \le x < 0.10.0≤x<0.112
0.1≤x<0.20.1 \le x < 0.20.1≤x<0.236
0.2≤x<0.30.2 \le x < 0.30.2≤x<0.342
0.3≤x<0.50.3 \le x < 0.50.3≤x<0.524
0.5≤x<0.90.5 \le x < 0.90.5≤x<0.96

For a sample of diesel cars, the CO emissions have mean 0.15 g/km and standard deviation 0.05 g/km.

a.

Estimate the mean CO emission of the 120 petrol cars.

[2]
b.

Estimate the standard deviation of the CO emissions of the 120 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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