If X follows a Poisson distribution with parameter λ = 3, what is P(X = 0)?
Correct answer: D. e^-3
- A. e^-1
- B. 1 - e^-3
- C. 3e^-3
- D. e^-3
Explanation
For a Poisson variable, P(X = x) = e^-λ λ^x/x!. When x = 0 and λ = 3, this becomes e^-3.
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