Edexcel S2 2022 June — Question 5

Exam BoardEdexcel
ModuleS2 (Statistics 2)
Year2022
SessionJune
TopicPoisson Distribution
TypeFinding maximum n for P(X=0) threshold

  1. The number of particles per millilitre in a solution is modelled by a Poisson distribution with mean 0.15
A randomly selected 50 millilitre sample of the solution is taken.
  1. Find the probability that
    1. exactly 10 particles are found,
    2. between 6 and 11 particles (inclusive) are found. Petra takes 12 independent samples of \(m\) millilitres of the solution.
      The probability that at least 2 of these samples contain no particles is 0.1184
  2. Using the Statistical Tables provided, find the value of \(m\)