Expected Value & Independance

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?

• $10

• $5.90

• $5

• $3.25

Tags

CCSS.HSS.MD.B.5A

Jamal owns a small business selling bagels. He knows that in the last week 77 customers paid cash, 27 customers used a debit card, and 21 customers used a credit card.

If next week, he is expecting 400 customers, Jamal should expect (a)   customers to pay with a credit card.

Tags

CCSS.7.SP.A.2

A spinner is divided into five colored sections that are not of equal size: red, blue, green, yellow, and purple. The spinner is spun several times, and the results are recorded as shown in the table.

If the spinner is spun 1300 more times, about how many times would you expect to land on yellow?

• 59

• 39

• 4

• 133

Tags

CCSS.7.SP.C.6

Hudson volunteers on the weekend at the Central Library. As a school project, he decides to record how many people visit the library, and where they go. On Saturday, 355 people went to The Youth Wing, 466 people went to Social Issues, and 363 went to Fiction and Literature.

On Sunday, the library had 400 total visitors. Based on what Hudson had recorded on Saturday, about how many people should be expected to go to Fiction and Literature? Round your answer to the nearest whole number.

• 1184

• 363

• 123

• 91

A random sample of students were surveyed as to how much non-school screen time they had each week and if their grade average was above or below an 80%.

What percent of the students reported screen time from 4-8 hours?

• 53%

• 29%

• 57%

• 33%

Tags

CCSS.8.SP.A.4

A random sample of students were surveyed as to how much non-school screen time they had each week and if their grade average was above or below an 80%.

What percent of the students who spend 4-8 hours a week on screens reported a grade average above 80?

• 53%

• 18%

• 34%

• 31%

Tags

CCSS.8.SP.A.4

A random sample of students were surveyed as to how much non-school screen time they had each week and if their grade average was above or below an 80%.

Are "4-8 hours" and "above" independent?

• Yes

• No

Tags

CCSS.HSS.CP.A.4

CCSS.HSS.CP.A.2

A group of students at a high school took a standardized test. The number of students who passed or failed the exam is broken down by gender in the following table.

What is P(female)?

• 40%

• 71%

• 29%

• 60%

Tags

CCSS.8.SP.A.4

A group of students at a high school took a standardized test. The number of students who passed or failed the exam is broken down by gender in the following table.

What is P(female | passed)?

• 40%

• 71%

• 29%

• 60%

Tags

CCSS.HSS.CP.A.4

A group of students at a high school took a standardized test. The number of students who passed or failed the exam is broken down by gender in the following table.

Are "female" and "passed" independent?

• Yes

• No

Tags

CCSS.HSS.CP.A.4

CCSS.HSS.CP.A.2