How is the expected outcome determined in a discrete distribution?

I do not understand this question. Could someone please help me.

Since this is not my area of expertise, I searched Google under the key words "discrete distribution" to get this:

http://www.google.com/search?client=safari&rls=en&q=discrete+distribution&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.