Ratio and Proportional Relationships

Lee will conduct a survey at his school. He will select a random sample of students at the school to take the survey. Which sample is the best random sample for Lee to use?

• every other student in the drama club

• every fifth student who enters the school

• every student who rides the same bus as Lee

• every fourth student in Lee’s homeroom class

The project manager at a new business inspects every tenth smart phone produced to check that it is operating correctly.

Classify the sample that was used. 

• systematic

• stratified

• self-selected

• convenience

• simple random

A restaurant orders corn tortillas and flour tortillas. The ratio of the number of corn tortillas to the number of flour tortillas is 2 : 3. What is the ratio of the number of flour tortillas to the total number of tortillas?

• 3 : 8

• 3 : 5

• 2 : 8

• 2 : 5

In the table, the ratio of y to x is constant.

What is the value of the missing number?

• 15

• 20

• 25

• 30

Sarah earns $400 per week and spends 15% of her earnings on transportation. How much does Sarah spend on transportation every week?

• $80

• $75

• $60

• $55

If 45% of a number, n, is 225, what is 74% of n?

• 185

• 298

• 370

• 406

At a middle school, 74 students have freckles. There are 258 students in the school. To the nearest tenth of a percent, what percent of the students have freckles?

• 18.4%

• 28.7%

• 34.6%

• 40.2%

Which of the following measurement is a unit rate?

• 20 inches

• 14 quarts in a barrel

• 3 seconds

There are six hats and seven mittens. What is the ratio of mittens to total?

• 6:7

• 7:6

• 13:7

• 7:13

What percentage of people surveyed prefer tacos?

• 30%

• 36%

• 38%

• 42%