The probability distribution of a discrete random variable is given below:
Value $x$ of $X$
-3
-2
-1
0
1
$P(X=x)$ 0.24
0.15
0.23
0.11
0.27
Let $Fx$ be the cumulative distribution function of X. Compute the following
$Fx(-1)=$
$ Fx(-2)-Fx(-3)=$
$ Fx(-9/4)=$
My answer
$Fx(-1)=0.23$
$Fx(-2)-Fx(-3)=0.15-0.24=-0.09
Is it correct?