Unit 8 Study Guide

1. Juanita and Nina are bowling together. The probability of Juanita getting a strike next game is 24%. The probability of Nina getting a strike next game is 0.17. Which of these events is more likely?

• Juanita gets a strike next game.

• Nina gets a strike next game.

• Neither. Both events are equally likely.

2. You flip a fair coin. What is the probability it lands on heads?

• 1/2

• 2/2

• 0/2

3. Jake is going to call one person from his contacts at random. He has 30 total contacts. 16 of those contacts are people he met at school. What is the probability he calls a person from school?

• 14/30

• 16/30

4. Elroy and Rose are at the store buying a school planner. There are 3 colors (pink, red, and blue) and 2 formats (lined and unlined) offered. They each created a display to represent the sample space of randomly picking a color and a format. Which displays correctly represent the sample space? Explain how you know.

• Rose

• Elroy

• Both

5. You're playing a game where you defend your village from an orc invasion. There are 3 characters (elf, hobbit, or human) and 5 defense tools (magic, sword, shield, slingshot, or umbrella) to pick from.

A) If you randomly choose your character and tool, what is the probability that you'll be a magic elf? B) If you randomly choose the race and the tool, which of these diagrams can be used to find all of the possible outcomes?

• 1/15 diagram A

• 1/15 diagram B

• 2/15 diagram A

• 2/15 diagram B

6. If you flip three fair coins, what is the probability that you'll get all three heads?

• 8/8

• 7/8

• 3/8

• 1/8

7. The box plots show the heights (in centimeters) of the players on the University of Maryland women's basketball and field hockey teams. Which pieces of information can be gathered from these box plots? Choose all answers that apply:

• The basketball players are taller on average.

• The heights of the basketball players vary noticeably more than those of the field hockey team.

• None of the above.

• All of the above

8. The school board administered a reading test to all eighth-grade students at High Achievers Charter School and determined that 10% of them were reading below grade level. Based on this data, which of the following conclusions are valid?

• 10% of students in this sample are reading below grade level, but we cannot conclude anything about the eighth-grade students at High Achievers Charter School.

• 10% of all students at High Achievers Charter School are reading below grade level.

• 10% of all eighth-grade students at High Achievers Charter School are reading below grade level.

Tags

CCSS.RI.6.1

CCSS.RI.7.1

CCSS.RL.6.1

CCSS.RL.7.1

CCSS.RL.8.1

9. Bella wants to conduct a survey to determine how many of the residents of Forks believe in supernatural creatures.

Which of the following survey methods will allow Bella to make a valid conclusion about the percentage of residents of Forks that believe in supernatural creatures?

• Ask a randomly selected sample of residents to answer the question anonymously.

• Ask a randomly selected sample of high school students to answer the question anonymously.

The Baltimore Ravens won the American football championship in 2013. In the same season, the Kansas City Chiefs had a record of 2 wins and 14 losses. The dot plots below show the 40-yard dash times (in seconds) of the defensive backs on each team's roster. (Defensive backs mainly defend against passes, and the 40-yard dash is the main measure of speed used in American football.) Remember that lower 40-yard dash times are faster. Which team had faster defensive backs? AND Which team had greater variability in the speeds of their defensive backs?

• Baltimore is faster, Baltimore range (or MAD) is larger

• Kansas is faster, Kansas range (or MAD) is larger

• Baltimore is faster, Baltimore range (or MAD) is smaller

• Kansas is faster, Kansas range (or MAD) is smaller