Mathematics 9709/71 — May/June 2018

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

questions

marks

minutes

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

Q13MSampling and EstimationFree sample

A random sample of 75 values of a variable $X$ gave the following results.

n = 75 \quad \sum x = 153.2 \quad \sum x^2 = 340.24

Find unbiased estimates for the population mean and variance of $X$ .

The rest of this paper

6 more questions

Q2Sampling and Estimation4M
Q3The Poisson Distribution4M
Q4Linear Combinations of Random Variables7M
Q5Sampling and Estimation · Hypothesis Tests9M
Q6Continuous Random Variables11M
Q7The Poisson Distribution · Linear Combinations of Random Variables · Hypothesis Tests12M

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