If X has a Poisson distribution with a mean of 2, what is P(X < 3)?
Added by Charles G.
Step 1
P(X = 0) = (e^-2 * 2^0) / 0! = e^-2 ≈ 0.1353 P(X = 1) = (e^-2 * 2^1) / 1! = 2e^-2 ≈ 0.2707 P(X = 2) = (e^-2 * 2^2) / 2! = 2e^-2 ≈ 0.2707 Therefore, P(X < 3) = 0.1353 + 0.2707 + 0.2707 = 0.6767 Show more…
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