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For a Poisson distribution, the mean is \(\mu\). The standard deviation is

1. \(\sqrt{\mu}\)
2. \(\mu^2\)
3. \(\mu\)
4. \(1/\mu\)

Correct answer: \(\sqrt{\mu}\)

Solution

In a Poisson distribution, the mean and variance are both equal to \(\mu\). Therefore, the standard deviation is \(\sqrt{\mu}\).

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