LT 1c Expected value

A $20 bill, two $10 bills, three $5 bills and four $1 bills are placed in a bag. If a bill is chosen at random, what is the expected value for the amount chosen?

In a game you flip a coin twice, and record the

number of heads that occur. You get 10

points for 2 heads, zero points for 1 head, and

5 points for no heads. What is the expected

value for the number of points you'll win per turn?

There is an equally likely chance that a falling dart will land anywhere on the rug above. The following system is used to find the number of points the player wins. What is the expected value for the number of points won? Black = 40 points Gray = 20 points White = 0 points

Eva flips a coin. If she gets heads, she wins $4. If she gets tails, she loses $3. What is her expected value of a coin flip?