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Homework Help: Poisson distribution

  1. Oct 19, 2015 #1
    1. The problem statement, all variables and given/known data
    A telephone operator receives four phone calls in three minutes on the average. Let a Poisson random number X denote the number of phone calls per minute to this operator.

    (a) Find the probability that this operator receives two phone calls in a minute.

    (b) Find the probability that this operator receives at least two phone calls in a minute.

    3. The attempt at a solution
    a) lamba = (4/3)(1) = (4/3) x = 2
    f(2, 4/3) = (4/3)^2 e^(-4/3)/ 2!

    b) 1- [ f(0, 4/3) + f(1,4/3)]

    I just want to make sure these will give me the correct answer because I must rely on the formula for the test. thank you
  2. jcsd
  3. Oct 19, 2015 #2


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    Homework Helper

    Those look right to me.
  4. Oct 19, 2015 #3
    thank you
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