If X follows a Poisson distribution with parameter λ = 2, what is P(X = 2)?
Correct answer: B. 4e⁻²
- A. 2e⁻²
- B. 4e⁻²
- C. e⁻²/2
- D. 1 − 2e⁻²
Explanation
The Poisson probability formula is P(X = x) = e⁻λ λˣ/x!. Substituting λ = 2 and x = 2 gives e⁻²(2²/2!) = 2e⁻².
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