SOLUTION: Suppose X is a Poisson random variable. If we have been told that the value of the parameter λ for this Poisson distribution is 8.7, what is the variance of X? (Give your ans

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Question 1122181: Suppose X is a Poisson random variable. If we have been told that the value of the parameter λ for this Poisson distribution is 8.7, what is the variance of X? (Give your answer to 1 decimal place.)
Thank you very much
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
everything i've read about poisson so far says that the variance is equal to the mean.

unless there's something else implied in this question, i would say the variance was 8.7 if the mean was 8.7.

here's a reference on the poisson distribution.

https://www.intmath.com/counting-probability/13-poisson-probability-distribution.php