Which of the Following Chances Has the Biggest Expected Return

Multiple Choice

Which of the following chances has the biggest expected return?

A) a 100% chance of getting $1,000
B) a 50% chance of winning $2,000 and a 50% chance of winning $0
C) a 50% chance of winning $2,000, 25% chance of winning $4,000 and a 25% chance of losing $4,000
D) All of the above have the same expected return.