Mathematics 9709/71 — May/June 2019
Cambridge A-Level · Probability & Statistics 2 · worked solutions for every part, with the mark scheme
6
questions
50
marks
75
minutes
Topics Linear Combinations of Random Variables · Hypothesis Tests · Sampling and Estimation · Continuous Random Variables · The Poisson Distribution
Q1Linear Combinations of Random VariablesFree sample
At an internet café, the charge for using a computer is 5 cents per minute. The number of minutes for which people use a computer has mean 23 and standard deviation 8.
(i)2M
Find, in cents, the mean and standard deviation of the amount people pay when using a computer.
(ii)3M
Each day, 15 people use computers independently. Find, in cents, the mean and standard deviation of the total amount paid by 15 people.
The rest of this paper
5 more questions- Q2Hypothesis Tests · Sampling and Estimation7M
- Q3Hypothesis Tests7M
- Q4Continuous Random Variables9M
- Q5The Poisson Distribution · Linear Combinations of Random Variables12M
- Q6Sampling and Estimation10M
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