D138 Activity: Making Inferences

Use a proportion to make an inference about the following situation.

A manager samples the receipts of every fifth person who goes through the line. Out of 50 people, 4 had a mispriced item. If 600 people go to this store each day, how many people would you expect to have a mispriced item?

• 48 people

• 7,500 people

• 12 people

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

Jerry randomly selects 20 boxes of crayons from the shelf and finds 2 boxes with at least one broken crayon. If the shelf holds 130 boxes, how many would you expect to have at least one broken crayon?

• 13 boxes

• 1,300 boxes

• 0.31 boxes

• 40 boxes

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

A university has 30,330 students. In a random sample of 270 students, 18 speak three or more languages. Predict the number of students at the university who speak three or more languages.

• 2,022 people

• 454,950 people

• 0.16 of a person

• 4,860 people

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

Gerald buys a bag of 7,500 assorted beads online. A random sample of 150 beads contains 20 red beads. Predict the number of red beads in the bag of assorted beads that Gerald bought.

• 1,000 red beads

• 56,250 red beads

• 0.4 red beads

• 3,000 red beads

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

A store manager selects 30 cartons of eggs and finds 2 cartons that have cracked eggs. If the store has 105 cartons of eggs, how many cartons can she expect to have cracked eggs in them?

• 7 cartons

• 1,575 cartons

• 0.57 cartons

• 60 cartons

Tags

CCSS.7.RP.A.3

Use a proportion to make an inference about the following situation.

Emanuel surveyed a random sample of 50 subscribers to Auto Wheel magazine about the number of cars they own. Of the subscribers surveyed, 15 own fewer than 2 vehicles. If there are 340 subscribers to Auto Wheel magazine, how many would you expect to own fewer than 2 vehicles?

• 102 subscribers

• 1,133.3 subscribers

• 2.21 subscribers

• 750 subscribers

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

Francis surveyed a random sample of 70 students at Franklin High School about their favorite season. Of the students surveyed, 18 chose fall as their favorite season. There are 1816 students at Franklin High School. Predict the number of students whose favorite season is fall.

• 467 students

• 7,062.2 students

• 0.69 students

• 1.44 students

Tags

CCSS.7.SP.A.2

Use a proportion to make an inference about the following situation.

A group of randomly selected members of Mothers’ Club were asked how many kids they have. The table shows the results of the survey. There are 120 members in Mothers’ Club. Predict the number of members that have fewer that 2 kids.

• 54 members

• 90 members

• 0.075 members

• 0.125 members

Tags

CCSS.7.SP.A.2