In a $90$ min game with $2$ teams, the chance of scoring a goal for each team is $0.05$.
What is the expected value for number of goals in the game in the last $20$ min? Is it possible to solve this $Q$ with this limited info?
I'm familiar with the $E(X=x) = x\cdot P(X = x)$ formula, but I can't figure out how to use it. What should I consider the $X$ and $x$ to be?