Calculators & Converters

    Poisson Distribution Example for λ = 2 & x = 7

    Poisson Distribution Calculator

    The below summary & example workout with step by step calculation shows how to estimate P(x), mean (μ), variance2) & standard deviation (σ) of Poisson probability distribution for the input values λ = 2, x = 7 may helpful for beginners to learn how the input parameters are being used in the Poisson formula in probability & statistical experiments or useful for grade school students to solve such similar worksheet or homework problems efficiently.

    Calculation Summary
    Success Rate (λ)2
    Random Variable (X)7
    P(X = 7)0.0034
    Mean (μ)2
    Variance (σ2)2
    Standard Deviation (σ)1.4142

    Solved Example Calculation for λ = 2 & x = 7

    This below solved example for Poisson probability distribution with step by step calculation shows how the input parameters λ = 2 & x = 7 are being used in the Poisson distribution formula to find the probability of success P(x).

    Work with step by step calculation :

    step 1 Address the formula, input parameters and values
    Success Rate (λ) = 2
    Random Variable (x) = 7

    step 2 Substitute success rate & random variable in the below Poisson probability distribution formula

    P(X = x) =e λxx!

    P(X = 7) =e-2 277!

    step 3 To find the factorial for 7
    7! = 1 x 2 x 3 x . . . . x 6 x 7
    7! = 5040

    step 4 Simplify the above expression

    P(X = 7) =e-2 275040

    =0.1353 x 1285040

    =17.32295040

    = 0.0034

    P(X = 7) = 0.0034
    Mean (μ) = 2
    Variance (σ2) = 2
    Standard deviation (σ) = 1.4142

    Thus, the probabilty of success P(x) is 0.0034 for λ = 2, x = 7.

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