### Home > GC > Chapter 12 > Lesson 12.1.3 > Problem12-28

12-28.

Jinning is going to flip a coin. If the result is “heads,” he wins $\4$. If the result is “tails,” he loses $\7$.

1. What is his expected value per flip?

Find the probability of each flip. Then use that to find the expected value of the flip.

$(0.5)(4)+(0.5)(-7)=-1.50$

2. If he flips the coin $8$ times, how much should he win or lose?