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

In a particular game, a fair die is tossed.  If the number of spots showing is either 4 or 5 you win $1, if the number of spots showing is 6 you win $4, and if the number of spots showing is 1, 2, or 3 you win nothing.  Let X be the amount that you win. 
Which of the following is the expected value of X?

• $1.00
• $2.50
• $4.00
• $6.00

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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

Tags

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

A car dealer buys hybrids for $21,000 each and sells them for $24,500 each. Find his expected weekly profit.

• $2,380
• $5,355
• $8,109
• $37,485

Tags

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

HINT: Read carefully! And think about the TOTAL amount of money being gained or lost in each situation!

• $275
• $625
• $2,750
• $6,250

Tags

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

A sample of 10 measurements has a mean of 15.7 and a sample of 20 measurements has a mean of 14.3. Find the mean of all 30 measurements.

• 16.3
• 14.8
• 17.1
• 21.4

Tags

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

A line up for tickets to a local concert had an average (mean) waiting time of 20 minutes with a standard deviation of 4 minutes. If 2000 ticket buyers were in line, how many of them would expect to wait for less than 16 minutes?

• 320

• 1550

• 100

• 30

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

CCSS.Math.Content.HSS.ID.A.4

The table shows the frequency of the number of visits to the doctor per year for a group of children. What is the mean?

• 2

• 2.2

• 3

• 7.5

Tags

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

Tags

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.

• 31.8

• 15.68

• 0.20

• 1.00

Tags

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