CCSS.Math.Content.HSS.MD.A.2

Is your expected value always going to be what happens in real life?

• yes
• no

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CCSS.Math.Content.HSS.MD.A.2

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean number of questions one gets correct when guessing.

• 2.5
• 3
• 3.5
• 1.5

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CCSS.Math.Content.HSS.MD.A.2

A random variable X has a mean of 5 and a st. dev of 0.40. A random variable Y has a mean of 8 and a st. dev of 0.60. If both are independent, what is the mean of X + Y?

• 13
• 6.5
• 14
• Not here.

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CCSS.Math.Content.HSS.MD.A.2

A stockbroker estimates that at the end of the year, there is a 40% chance a stock will be worth $50, a 35% chance it will be worth $60 and a 25% chance it will be worth $70.
What expected value does this broker assign to this stock's end-of-the-year price?

• $58.50
• $60.00
• $62.50
• $65.00

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CCSS.Math.Content.HSS.MD.A.2

Find the expected value. READ CAREFULLY!

• 4.5
• 25.5
• 3.825
• 6.52

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CCSS.Math.Content.HSS.MD.A.2

Find the expected value

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

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CCSS.Math.Content.HSS.MD.A.2

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean and the standard deviation.

• μ = .4; σ = 7.5

• μ = 2.5; σ = 1.1

• μ = 3; σ = 1.3

• μ = .1; σ = 0

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CCSS.Math.Content.HSS.MD.A.2

The table above shows a television station's advertisement sales. The distribution of sales for one 24-hour day is given. Solve for the mean. Round to the nearest hundredth.

• 31.80

• 15.68

• 0.20

• 1.00

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CCSS.Math.Content.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

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CCSS.Math.Content.HSS.MD.A.2

The temperature in Michigan City on this date in the last ten years were: 68, 68, 69, 70, 72, 70, 68, 75, 55, 67. What is the mean temperature on this date over the last ten years? (Round to nearest whole number.)

• 60

• 61

• 68

• 69

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CCSS.Math.Content.HSS.MD.A.2