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2.2.3 Central tendency, variation and standard deviation

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Question 8

The CO $_2\,$ emissions, $x\,$ g/km, of 20 cars are coded using

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

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

Find the mean of the CO $_2\,$ emissions.

[2]

Find the standard deviation of the CO $_2\,$ emissions.

[1]

State the effect on the standard deviation of subtracting 150 from every value.

[1]

Markscheme

2.2.3 Central tendency, variation and standard deviation Questions

A Level
Maths
2.2.3 Central tendency, variation and standard deviation

39 exam-style questions on AQA A Level Maths 2.2.3 Central tendency, variation and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.

2.2.3 Central tendency, variation and standard deviation

Question bank

2.2.3 Central tendency, variation and standard deviation

Easy Medium Hard

1 2 3 4 5 6 7 8 9 10 11 12

Question 8

The CO $_2\,$ emissions, $x\,$ g/km, of 20 cars are coded using

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

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

Find the mean of the CO $_2\,$ emissions.

[2]

Find the standard deviation of the CO $_2\,$ emissions.

[1]

State the effect on the standard deviation of subtracting 150 from every value.

[1]

Markscheme

2.2.3 Central tendency, variation and standard deviation Questions

A Level
Maths
2.2.3 Central tendency, variation and standard deviation

39 exam-style questions on AQA A Level Maths 2.2.3 Central tendency, variation and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.