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Binomial & Poisson Distributions · Question 45 of 68

Question 45

EasyOriginal question

A Poisson distribution has mean 3. What is its variance?

Options for question 45

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. In a Poisson distribution the mean and the variance are both λ\lambda.

  2. So the variance is 3 as well.

Worth noting

9 squares the mean; for a Poisson variable the variance is the mean itself.

Concept
The mean equals the variance
Typical time
60 s
Your time
—
The rule this testsThe Poisson distribution
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Ten questions from Binomial & Poisson Distributions, at your own pace.

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Ten questions from Binomial & Poisson Distributions, at your own pace.

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