SOCR EduMaterials Activities Poisson Distribution

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  • Exercise 1: Use SOCR to graph and print the distribution of a Poisson random variable with \( \lambda=2 \). What is the shape of this distribution?
  • Exercise 2: Use SOCR to graph and print the distribution of a Poisson random variable with \( \lambda=15 \). What is the shape of this distribution? What happens when you keep increasing \( \lambda \)?
  • Exercise 3: Let \( X \sim Poisson(5) \). Find \( P(3 \le X < 10) \), and \( P(X >10 | X \ge 4) \).
  • Exercise 4: Poisson approximation to binomial: Graph and print \( X \sim b(60, 0.02) \). Approximate this probability distribution using Poisson. Choose three values of \( X \) and compute the probability for each one using Poisson and then using binomial. How good is the approximation?


Below you can see the distribution of a Poisson random variable with \( \lambda=5 \). In this graph you can also see the probability that between 2 and 5 events will occur.

SOCR Activities Christou poisson.jpg


  • Exercise 5: People enter a gambling casino at a rate of 1 for every two minutes.
    • What is the probability that no one enters between 12:00 and 12:05?
    • What is the probability that at least 4 people enter the casino during that time?
  • Exercise 6: Let \(X_1\) denote the number of vehicles passing a particular point on the eastbound lane of a highway in 1 hour. Suppose that the Poisson distribution with mean \(\lambda_1=5\) is a reasonable model for \(X_1\). Now, let \(X_2\) denote the number of vehicles passing a point on the westbound lane of the same highway in 1 hour. Suppose that \(X_2\) has a Poisson distribution with mean \(\lambda_2= 3\). Of interest is \(Y= X_1 X_2\), the total traffic count in both lanes in one hour. What is the \(P(Y < 5) ?\)





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