For a Poisson distribution with parameter λ = 4, what is the variance of the distribution?
Correct answer: B. 4
- A. 2
- B. 4
- C. 8
- D. 16
Explanation
For a Poisson distribution, both the mean and the variance equal λ. Hence, when λ = 4, the variance is also 4.
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Probability covers sample spaces, events, complements, mutually exclusive and independent events, conditional probability, addition and multiplication rules, and tree diagrams. Distributions describe discrete random variables through probability tables, expected value and variance, including binomial and normal models where their conditions and parameters must be identified.
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