Skip to content

Course home

2.5 Data presentation and interpretation

2.5 Data presentation and interpretation

Easy Medium Hard

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Question 4

A variable $x\,$ has mean 12 and standard deviation 2. A second variable is defined by $y = 3 x - 5$ .

a.

Find the mean and variance of $y$ .

[3]

b.

A single unusually large value is then added to the $y\,$ data. State and explain the likely effect on the mean and variance.

[2]

Markscheme

2.5 Data presentation and interpretation Questions

A Level
Maths
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.

Question bank