Mathematics 9709/72 — May/June 2015

Cambridge A-Level · Probability & Statistics 2 (S2) · worked solutions for every part, with the mark scheme

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Topics Linear Combinations of Random Variables · Hypothesis Tests · The Poisson Distribution · Sampling and Estimation · Continuous Random Variables

Q13MLinear Combinations of Random VariablesFree sample

The independent random variables $X$ and $Y$ have standard deviations 3 and 6 respectively. Calculate the standard deviation of $4X - 5Y$ .

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