U7: Test Retake Data, Statistics, and Probability

An internet company randomly selected 50 of its customers and asked them how many hours per week they use the internet. Of those surveyed, 28 use the internet more than 15 hours per week. Based on the data, if the company has 800 subscribers, how many use more than 15 hours per week?

• 448 subscribers

• 200 subscribers

• 600 subscribers

• 350 subscribers

In 5th period, a survey is conducted to determine the number of family members in each student’s family. The results from the band and choir classes are shown below. What is the median number of family members in band class? Choir class?

• Band class: 4, Choir class: 5

• Band class: 5, Choir class: 6

• Band class: 6, Choir class: 5

• Band class: 5, Choir class: 4

In 5th period, a survey is conducted to determine the number of family members in each student’s family. The results from the band and choir classes are shown below. Compare the distribution of data.

• The band class has more students with larger families.

• The choir class has more students with larger families.

• Both classes have the same distribution of family sizes.

• The distribution cannot be determined from the given data.

Given the situation below, describe a possible random sample:

A school board member surveys parents to learn how they feel about the new school uniforms.

• The school board could send a survey to every parent within the school district.

• The school board could send a survey to every fourth parent within the school district.

• The school board could send a survey to parents who have children in the same grade.

• The school board could send a survey to parents who attend PTA meetings.

13. Given the situation below, which of the following describes a possible random sample?

A local grocery store would like to determine which new products to carry.

• Surveying every tenth customer as they enter the store

• Surveying only customers who buy organic products

• Surveying customers who visit the store on weekends

• Surveying customers who spend more than $50

Bills are due on the 32nd of the month. (Choose the likelihood)

• impossible

• likely

• certain

It will rain if there is thunder. (Choose the likelihood)

• impossible

• likely

• certain

If you do your homework, your grades will improve. (Choose the likelihood)

• impossible

• likely

• certain

In Mr. Martinez's sixth period class, there are 8 bus riders and 12 walkers. What is the probability of randomly selecting a student that walks to school?

The weather report says there is a 30% chance of rain. What is the probability that it does not rain?

• 70%

• 30%

• 50%

• 90%