6.1 Expected value

If the expected value is negative, are you expected to win?

• yes
• no

Tags

CCSS.HSS.MD.A.2

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?

• $1

• $0.50

• -$0.50

• $0

Tags

CCSS.HSS.MD.B.5A

In a certain community, 30% of households have 1 child, 43% have 2 children, and 27% have 3 children. If a household is selected at random, what is the expected number of children in that household?

• 2.00

• 2.13

• 1.97

• 1.27

Tags

CCSS.HSS.MD.A.2

If the expected value is positive, are you expected to win?

• yes
• no

Tags

CCSS.HSS.MD.B.5B

Expected value is

• an average.

• a predicted value of a game.

• the sum of the values multiplied by their probabilities.

• all of the above.

Tags

CCSS.HSS.MD.A.2

Find the mean (expected value) of the probability distribution.

• 85

• 83.2

• 87.1

• 84.4

Tags

CCSS.HSS.MD.A.2

Given the probability model in the table below, what is the expected value of the random variable?
  X        50          20        5
P(X)     0.1         0.3      0.6

• 14
• 4.67
• 5
• 7.5

Tags

CCSS.HSS.MD.A.2

What do you need to determine before you can calculate expected value?

• number of people playing
• probability of winning 
• name of game
• names of people playing

Tags

CCSS.HSS.MD.A.2

Number of Thunderstorms during August
Number of Storms    0     1      2      3
Probability               0.2   0.2   0.4   0.2
How many storms should we expect in August?

• 1.8
• 2.0
• 1.6
• 2.2

Tags

CCSS.HSS.MD.A.2

Find the mean (expected value) of the probability distribution.

• 85

• 83.2

• 87.1

• 84.4

Tags

CCSS.HSS.MD.A.2