Solution
= Solution
Subtract the first three values of the <probability mass function> of the <Poisson distribution> from one:
$$
\boxed{\mathbb P(X\geq3)=1-e^{-2}\left(1+2+\frac{2^2}{2!}\right)=1-5e^{-2}\approx0.323324.}
$$
= Solution
Subtract the first three values of the <probability mass function> of the <Poisson distribution> from one:
$$
\boxed{\mathbb P(X\geq3)=1-e^{-2}\left(1+2+\frac{2^2}{2!}\right)=1-5e^{-2}\approx0.323324.}
$$