7th Grade Unit 4 Test

1. A grocery store polls every twentieth customer to determine if they are satisfied with the cleanliness of the store. Forty customers are surveyed, and 26 are satisfied. What conclusion can be drawn for the 800 daily customers?

• A. 65% of the customers are unsatisfied with the cleanliness of the store.
• B. Of the 800 customers, 520 would be satisfied with the cleanliness of the store.
• C. 40% of the customers are satisfied with the cleanliness of the store.
• D. 25% of the customers are not satisfied with the cleanliness of the store.

2. Airfare from Atlanta, GA to Nashville, TN changed from $250 per ticket to $180 per ticket. By what percentage did the cost of the airfare change?

• A. An increase of 28%
• B. An increase of 39%
• C. A decrease of 28%
• D. A decrease of 39%

3. Students are asked to estimate the number of gumballs in a jar. Ian says there are 228 gumballs. In actuality, there are 240 gumballs. What is the percent error?

• A. 3.5%
• B. 6%
• C. 5%
• D. 12%

4. The table below shows the various ways students get home from school. What percent of students walk home from school?

5. Mr. Robins earns a commission on each airfare he books. At the end of the day, he had booked $208.60 worth of airfare and earned $31.29. Approximately what is Mr. Robins' commission rate?

• A. 10%
• B. 15%
• C. 8.5%
• D. 7%

6. A wise financial principle states that your rent should be no more than 30% of your income. Which equation can be used to find x, the amount Emilio should spend on rent if he brings home $2,000 per month?

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7. If there are 220 members of the 7th grade class, then how many students can be expected to prefer the zoo?

• A. 39
• B. 48
• C. 120
• D. 66

8. If there are 180 members of the 8th grade class, then what percent preferred either the museum or the sports complex?

• A. 65%
• B. 47.5%
• C. 17.5%
• D. 26%

9. A company surveyed all of the employees in their Columbus, Ohio office, one of their six national offices. Based on the survey, they determined that 72% of all employees were satisfied with their job. Which of the following explains why this is NOT a random sample?

• A. They only surveyed people who had been at their job for five years or more
• B. They did not survey employees in other offices around the country
• C. The survey was conducted electronically
• D. The survey had a time limit

10a. What is the median of the first half of the data? (first quartile)

• 223
• 196

• 198

• 379