Positive expectancy calculation

I am far from beeing a math wizard , but i know there are some in FF .

Can one of you help me calculate this ?


Imagine you have 8 possible outcomes with gain/loss as follows :

-2
-7
+1
+2
+3
-2 or +1 or +2 or +3
-2 or +1 or +2 or +3
-2 or +1 or +2 or +3

I could calculate if there were only fixed values, but i can not incorporate those possibilities that have multiple possibilities.

Could you help me please and tell me if there is positive expectancy in the long run ?

Look up conditional probabilities. Covered in most statistic courses. There are free videos about it on Kahn Academy, Coursera, and YouTube I am sure.

If any trader wants to be technical, I would suggest taking Coursera's statistics I and II college classes as they will give you a very good understanding of probabilities and statistics and how to interrupt them. The classes are also free.