Unit 5: Investigating Probability Study Guide

Elena would like to know the average speed that people drive on her street. She tracks the speed of 30 random cars that drive through with a speedometer. The mean of Elena’s sample is 30 miles per hour, and the MAD (mean absolute deviation) is 3.

• Elena would be more like to get an accurate estimate of the mean speed of the population by sampling 60 cars instead of sampling 30 cars.

• The median speed of the sample must be between 25 and 35 miles per hour.

• Another random sample of 30 cars is likely to have a mean between 24 and 36 miles per hour.

• The mean speed of these 30 cars is likely to be the same as the mean speed of the second sample of 30 cars.

• The mean speed of these random cars is likely to be the same as the mean of all cars that drive in a residential area

Tags

CCSS.7.SP.A.2

Here is a dot plot showing how many books are read by each student per month. Which of the following is a representative sample of the population?

• Dot plot A

• Dot plot B

• Dot plot C

• Dot plot D

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A school plans to start selling snacks at their basketball games. They want to know which snacks would be most popular. What is the population for the school’s question?

• All the people who attend the basketball games (students, parents, staff, etc.)

• Only the students who play basketball

• Only the teachers at the school

• All students in the school, even if they don't attend the games

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A school plans to start selling snacks at their basketball games. They want to know which snacks would be most popular. Give an example of a sample the school could use to help answer their questions.

• A sample could be a group of students who attend the basketball games.

• A sample could be a group of teachers who do not attend the games.

• A sample could be a group of students who never eat snacks.

• A sample could be a group of parents who live in another city.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

In which class did students spend less time on their homework?

Tags

CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

Which class has less variability in the amount of time spent on homework?

Tags

CCSS.7.SP.B.4

Marcus made 18 out of 25 free throw attempts during basketball practice. Which statement best describes the experimental probability of Marcus making a free throw?

• The probability is 18/25 = 0.72, which indicates the event is unlikely.

• The probability is 18/25 = 0.72, which indicates the event is likely.

• The probability is 7/25 = 0.28, which indicates the event is unlikely.

• The probability is 7/25 = 0.28, which indicates the event is likely.

Tags

CCSS.7.SP.C.6

Jackson creates a spinner with 8 equal sections numbered 1 through 8. He spins it 40 times and records the following results: - Landed on an odd number: 23 times - Landed on an even number: 17 times Based on the theoretical probability model, how many times would you expect the spinner to land on an odd number in 40 spins?

• 10 times

• 17 times

• 20 times

• 23 times

Tags

CCSS.7.SP.C.6

Find the MAD (mean absolute deviation) for the following data set: 15, 17, 15, 17, 21, 17, 15, 23, 20, 18.

• Mean Absolute Deviation: 2.2

• Mean Absolute Deviation: 3.5

• Mean Absolute Deviation: 1.7

• Mean Absolute Deviation: 4.0

Tags

CCSS.6.SP.B.5C

What are the central tendencies for the following data set? (round to the nearest tenth) {21, 21, 22, 23, 25, 27, 28, 31, 34, 34, 34, 37}

• Mean: 28.1, Median: 27.5, Mode: 34

• Mean: 27.5, Median: 28.1, Mode: 34

• Mean: 28.1, Median: 28.0, Mode: 34

• Mean: 27.5, Median: 27.5, Mode: 34

Tags

CCSS.6.SP.B.5C