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2.5 Data presentation and interpretation

2.5 Data presentation and interpretation

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Question 76

A variable x x\,x has mean 4 and standard deviation 1.5. A new variable is defined by y=2x+5y=2x+5y=2x+5.

a.

Find the mean of yyy.

[1]
b.

Find the standard deviation of yyy.

[1]
c.

Explain why adding 5 does not change the standard deviation.

[1]
Markscheme

2.5 Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.5 Data presentation and interpretation

278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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