Help! Financial expectation (1 Viewer)

[PuppyMagician]

96 people purchased a $6 ticket for a lucky door prize. The first prize was $240, second prize was $120 and there were two third prizes worth $60 each. What is the financial expectation?


Answer at the back of the book = -$0.75

 

[Shangwlux]

Just tried to figure it out... i couldn't figure it out.. then i realise i might have forgotten how to do it, had to quickly go back to my textbook and revise, turned out it was fine..
So i guess your question is pretty hard..