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# Poisson Probability Calculator Tool

Instructions: Compute poisson probabilities using the form below. Please type the population mean (λ), and provide details about the event you want to compute the probability for:

Population mean (λ) =

Two-Tailed:    ≤ X ≤

Left-Tailed:    X ≤

Right-Tailed:    X ≥

More about the Poisson distribution probability so you can better use the Poisson calculator above: The Poisson probability is a type of discrete probability distribution that can take random values on the range $$[0, +\infty)$$. The main properties of the Poisson distribution are:

• It is discrete, and it can take values from 0 to $$+\infty$$.

• The type of skewness depends on the population mean ($$\lambda$$)

• It is determined by the population mean ($$\lambda$$)

• Its mean is $$\lambda$$ and its population variance is also $$\lambda$$

Using the above Poisson distribution curve calculator, you are able to compute probabilities of the form $$\Pr(a \le X \le b)$$, of the form $$\Pr(X \le b)$$ or of the form $$\Pr(X \ge a)$$.Type the appropriate parameter for $$\lambda$$ in the text box above, select the type of tails, specify your event and compute your Poisson probability.

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