Skip to content

Course home

2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748
Question 32

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

y=x−15010\displaystyle y = \frac{x - 150}{10}y=10x−150​

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 150 from every value.

[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.

Question bank