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Poisson Mean Confidence Interval Calculator

Compute the exact 90%, 95%, and 99% confidence intervals for a Poisson mean, given the total number of number of event occurrences. Knowing the confidence interval for a Poisson mean can be very useful for analytics studies that use the Poisson distribution to examine interval data.

Please provide the necessary values, and then click 'Calculate'.

Observed event occurrences:
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