Test Index

Theoretical Distribution

Question : 18 of 118

Marks: +1, -0

For a Poisson distribution,

Solution:

Concept:

For a Poisson distribution, the mean is always equal to the variance.

Explanation:

For a Poisson distribution with parameter

\lambda

, the mean is

\lambda

and the variance is also

\lambda

Standard deviation is

\sqrt{\lambda}

, which is not equal to the mean unless

\lambda = 1

Thus, only mean and variance are equal.

Answer:

Option B is correct.

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