Expected Value

Choose an American household at random. What is the expected number of cars for that household?

• 1.75
• 1.84
• 2.00
• 2.50

Tags

CCSS.HSS.MD.A.2

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? HINT: A Probability table may be helpful.

• 2.00
• 2.13
• 1.97
• 1.27

Tags

CCSS.HSS.MD.A.2

Find the expected value. READ CAREFULLY!

• 4.5
• 25.5
• 3.825
• 6.52

Tags

CCSS.HSS.MD.A.2

Find the expected value

• Loss of $0.875
• Loss of $2.125
• Win of $1.875
• Win of $3.125

Tags

CCSS.HSS.MD.B.5A

Out of 10 balloons, two are small, five are medium, and three are large. Find the probability of randomly selecting a small balloon.

• 2:8

• 8:10

• 2:10

• 8:2

Tags

CCSS.7.SP.C.7B

Find the probability of drawing a black eight out of 52 cards in a standard deck.

• 1/25

• 1/52

• 4/52

• 1/26

Tags

CCSS.7.SP.C.7B

You roll a standard number cube once. Find P(greater than than 7)

• 0

• 1

• 6/7

• 5/6

Tags

CCSS.7.SP.C.5

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

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

• yes
• no

Answer explanation

If the result is negative you will expect to lose money.

Tags

CCSS.HSS.MD.A.2

You roll a standard die. You win $12 if you roll a six, $6 if you roll a one, and $0 if you roll anything else. What is the expected value of a single roll?

• $3

• $18

• $9

• $2

Answer explanation

P(6) x $12 + P(1) x $6 - P(2 or 3 or 4 or 5) x $0

1/6 x $12 + 1/6 x $6 - 4/6 x $0

$2 + $1 = $3

Tags

CCSS.HSS.MD.B.5A