Question 436115
{{{1 - sum(p(x),x = 0,5) =1 - ( e^(-2.6)(2.6^0/0! + 2.6^1/1! + 2.6^2/2! + 2.6^3/3! + 2.6^4/4! + 2.6^5/5! )) = 1 - 0.951 = 0.049 }}}, to 3 decimal places.