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2 Unit AS 2: Applied Mathematics

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

Find the mean and variance of $y$ .

[3]

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

[2]

2 Unit AS 2: Applied Mathematics Questions

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

Find the mean and variance of $y$ .

[3]

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

[2]