Lesson 23 Fluency w.s. "Making Inferences About Populations"

A zoologist studies a population of 800 rabbits. He tags 160 rabbits at random, of which 37 have blue eyes. Based on this data, about how many rabbits in the population have blue eyes?

• 165

• 185

• 45

• 25

Tags

CCSS.7.SP.A.2

Carmen surveys a random sample of 35 students from her school. Of these students, 2 are chess club members. If there are 550 students at her school, how many of them are likely to be chess club members?

• 29

• 30

• 31

• 32

Tags

CCSS.7.SP.A.2

Taylor is producing graphic T-shirts that will come in three different colors. He randomly surveys 100 people, asking which one of the three colors they prefer. Of the 100 people surveyed, 55 say that they prefer the white T-shirt. If Taylor is going to produce 500 graphic T-shirts, about how many should be white?

• 250

• 55

• 100

• 275

Tags

CCSS.6.RP.A.3B

A sociologist is doing a study on journalists. He attends a journalism conference, where he randomly surveys 390 journalists about the kind of automobile they own. Of these journalists, 137 said that they own a compact car. There are about 1,700 journalists at the conference. About what percent of these journalists owns a compact car?

• 35%

• 40%

• 25%

• 90%

A dentist asks a random sample of 75 patients whether they prefer mint, bubblegum, or cinnamon flavor toothpaste. Of these patients, 8 said that they prefer bubblegum. Based on the results of this sample, about how many of the dentist's 1,500 active patients prefer bubblegum flavor toothpaste?

• 80

• 100

• 160

• 800

Tags

CCSS.7.SP.A.2

In a survey of 653 randomly chosen workers from a manufacturing plant, 68 said that they prefer to work the night shift. The manufacturing plant employs a total of 2,700 workers. Based on this information, about how many plant workers prefer the night shift?

• 561

• 341

• 231

• 281

Tags

CCSS.7.RP.A.2C

A music streaming service surveys a random sample of 254 of its members about their favorite genre of music. Of the members surveyed, 107 said that techno is their favorite. The service has 734 members. Based on this information, what is the most reasonable estimate of members whose favorite type of music is techno?

• 309

• 453

• 350

• 200

Tags

CCSS.7.SP.A.2

At Lake Clay, marine biologists catch, tag, and release 50 smallmouth bass. Over the next few days, they catch 175 smallmouth bass, of which 7 have the original tags. What is the estimated population of smallmouth bass in Lake Clay?

• 1,500

• 350

• 1,250

• 900

Tags

CCSS.7.SP.A.2