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2 Unit 2: Applied Mathematics A

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Question 88

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]
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2 Unit 2: Applied Mathematics A Questions

  1. A Level
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