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9709/53

Mathematics 9709/53 — October/November 2022

Cambridge A-Level · Probability & Statistics 1 · worked solutions for every part, with the mark scheme

7
questions
50
marks
75
minutes

Topics Discrete Random Variables · Probability · Representation of Data · The Normal Distribution · Permutations and Combinations

Q13MRepresentation of DataFree sample

50 values of the variable xx are summarised by

Σ(x−20)=35andΣx2=25 036.\Sigma(x - 20) = 35 \quad \text{and} \quad \Sigma x^2 = 25\,036.

Find the variance of these 50 values.

The rest of this paper

6 more questions
  • Q2The Normal Distribution · Discrete Random Variables5M
  • Q3Representation of Data7M
  • Q4Probability · Discrete Random Variables8M
  • Q5Discrete Random Variables · The Normal Distribution9M
  • Q6Permutations and Combinations · Probability10M
  • Q7Probability8M
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