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Binomial & Poisson Distributions · Question 46 of 68

Question 46

EasyOriginal question

A Poisson distribution has mean 4. What is its standard deviation?

1

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2

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4

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16

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Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

For a Poisson distribution the variance equals the mean: 4.
Standard deviation $= \sqrt{4} = 2$ .

Worth noting

4 is the variance; the standard deviation is its square root.

Concept: The standard deviation of a Poisson distribution
Typical timeTypical: 60 s
Your timeYours: —

The rule this testsThe Poisson distribution

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