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2 Unit 2: Applied Mathematics A

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Question 126

The CO2 _2\,2​ emissions, x x\,x g/km, of 20 cars are coded using

y=x−50010\displaystyle y = \frac{x - 500}{10}y=10x−500​

For the 20 coded values, the mean is 2.4 and the standard deviation is 0.6.

a.

Find the mean of the CO2 _2\,2​ emissions.

[2]
b.

Find the standard deviation of the CO2 _2\,2​ emissions.

[1]
c.

State the effect on the standard deviation of subtracting 500 from every value.

[1]
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2 Unit 2: Applied Mathematics A Questions

  1. A Level
  2. /Maths
  3. /2 Unit 2: Applied Mathematics A

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