CAB (2018/2019) Probability and Statistics

A consultant identified four major sectors of a city to conduct a simple survey of the population. Each sector of the city contains approximately the same number of people. The consultant is planning a survey about whether the city's population wants to add bicycle lanes to the main streets.

Which random sampling method would create the most accurate sample survey of the city's population?

• asking the same number of people from each of the four major sectors

• asking the same number of bicyclists from each of the four major sectors

• asking everyone who passes through a park at the border of two major sectors

• asking everyone who answers their door on one street in one major sector

Tags

CCSS.HSS.IC.B.3

The table shows the rankings and tuition's of the top 125 universities in the U.S.Which is the closest to the probability that a randomly selected university from these 125 would be in the top 50 and have a tuition less than or equal to $40,000?

• 0.26

• 0.21

• 0.19

• 0.48

A school librarian wants to increase the number of students who read in their free time. He conducts a survey aimed at finding out what kinds of reading material would make students at this school most likely to read in their free time. Which random sample would give the librarian the most useful results?

• 20 students in a history class

• 100 students who participate in after-school sports

• 20 students in the school library

• 100 students in the cafeteria during lunch

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

There are 4 flavors of ice pops in the freezer: lime, grape, orange and cherry. If a person chooses one from the box the probability is: lime 1/12 grape 1/8 and orange 7/24

What is the probability of choosing red. (hint: you will need to find it's probability first!)

• as likely as not

• unlikely

• certain

• likely

Tags

CCSS.7.SP.C.5

Anita collects stamps form different countries. She has 14 stamps from Spain, 22 from France, 18 from England, and 16 from Italy. She randomly picks one of the stamps. What is the probability she will randomly pick a stamp from Spain or Italy?

• 1/5

• 1/2

• 3/4

• 3/7

Tags

CCSS.HSS.CP.B.7

Justin is making 3 digit numbers out of 4,6, and 8. Each number may only be used once. What is the probability that he will make a number greater than 600?

• 4/9

• 1/6

• 1/3

• 2/3

Tags

CCSS.HSS.CP.B.9

• 13

• 3

• 30

• 42

Tags

CCSS.6.SP.B.5C

Jenny and Frank each surveyed 20 students in 7th grade to determine which student will win the election for class president. (see table)

Which statements are true about the survey results. Select ALL that apply!

• The variation between the results is great.

• The results are not reasonable.

• Jenny and Frank have similar data.

• The results are reasonable.

• Jenny and Frank need to collect more data before making a prediction.

Tags

CCSS.7.SP.A.2

How do class sizes compare between the two schools?

• Overall, classes from school A are smaller.

• Overall, classes from school B are smaller.

• All classes at school A are smaller than the classes at B.

• There is no difference in class size between the two schools.

Tags

CCSS.7.SP.B.4

On a game show, a contestant randomly chooses an envelope and wins the prize that is written inside. There are 3 envelopes containing a car, 5 containing a vacation, and 2 containing electronics. What is the probability that a contestant picks a vacation?

• 5

• 3/10

• 1/2

• 1/5

Tags

CCSS.7.SP.C.7B