ANSWER
P(X=4 or X=1)=0.20
EXPLANATION
From the probability distribution table,
p(X=4)=0.15
p(X=1)=0.05
We want to find the value of
P(X=4 or X=1).
Recall that:
P(X=4 or X=1)=P(X=4)+P(X=1)
P(X=4 or X=1)=P(X=4)+P(X=1)
We substitute the probability values;
P(X=4 or X=1)=0.15+0.05
P(X=4 or X=1)=0.20
