What is the expected value of X?
X 0 1 2 3 4 P 0.2 0.05 0.15 0.35 0.25
a. 2
b.2.25
c.2.4
d. 2.75
To find the expected value mutiply each value (X) by the probability that it occurs (P).
Then add all those answers together.
+511 
