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2 Statistics

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Question 189

For a sample of values, the mean of x x\,x is 12 and the sample standard deviation is 3. A new variable is defined by y=2x−5y=2x-5y=2x−5.

a.

Find the mean of yyy.

[2]
b.

Find the sample standard deviation of yyy, explaining why subtracting 5 has no effect on it.

[2]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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