A random variable $X$ has Poisson distribution with mean $2$. Then $P\left( {X > 1.5} \right)$ equals :

Question

A random variable $X$ has Poisson distribution with mean $2$.
Then $P\left( {X > 1.5} \right)$ equals :

${2 \over {{e^2}}}$

$0$

$1 - {3 \over {{e^2}}}$

${3 \over {{e^2}}}$

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