If you want to find the binomial probability $\displaystyle P(-3.5 \leq X \leq 4.5) $ with $\displaystyle X \sim \text{Bin}(10,0.5) $ do you just round the endpoints?
If you want to find the binomial probability $\displaystyle P(-3.5 \leq X \leq 4.5) $ with $\displaystyle X \sim \text{Bin}(10,0.5) $ do you just round the endpoints?
$\displaystyle P(-3.5 \leq X \leq 4.5) = \sum_{i=-3}^{4} P(X=r)=\sum_{i=0}^{4} P(X=r)$
as for a binomial RV $\displaystyle X$, $\displaystyle P(X<0)=0$