"P(X>3)=1-P(X\\le3)=1-(P(X=0)+P(X=1)+P(X=2)+P(X=3))="
"=1-e^{-2.7}(\\frac{2.7^0}{0!}+\\frac{2.7^1}{1!}+\\frac{2.7^2}{2!}+\\frac{2.7^3}{3!})=0.2859."
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