Making Predictions and Inferences in Math

A survey was taken at a school of 30 students favorite food. The circle graph shows the number of students who selected each. Based on the information in the graph, which inference about the favorite food of all students appears to be valid?

• It is certain that a student will choose Pizza

• It is less likely that a student will choose Pasta or Hamburgers over Pizza

• It is certain that a student will NOT choose Pasta

• It is more likely that a student will choose Pizza over Hamburgers, Pasta, or Other combined

Tags

teks 7.12B

inferences

circle graph

pie chart

A random survey was conducted at an office about the workers favorite office supply. The results are shown in the table below. Based on the information in the table, which inference about favorite office supply of all the workers appears to be valid?

• It is certain that an office worker will NOT choose Tape as their favorite office supply

• It is certain that an office worker will choose Paper as their favorite office supply

• It is more likely that an office worker will choose Pens, Staplers, or Paper Clips over Paper

• More people like Staplers or Paper Clips over Pens/Pencils

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tables

teks 7.12B

inferences

The circle graph shows the results of a random survey of students who plan to attend the school dance. Based on the information in the graph, which inference about the general population of students is valid?

• More 6th graders than 7th and 8th graders plan to attend the dance

• 8th graders do not like to dance

• It is certain that a 6th grader will attend the dance

• It is more likely that a 7th grader will attend the dance than a 8th grader attending

Tags

inferences

pie chart

circle graph

teks 7.12B

A random survey of people at the mall was taken to determine favorite color. The results are shown in the circle graph. Based on the information in the graph, which inference about the general population is valid?

• It is more likely someone will choose Blue than Red or Pink

• It is certain that someone will NOT choose Black

• It is less likely someone will choose Red than Green, Pink, or Purple

• More people like Blue than all other colors combined

Tags

inferences

circle graph

pie chart

teks 7.12B

Petunia conducted a random survey of students to determine the favorite genre of music of 50 students. The results are shown in the bar graph. Based on the information in the graph, which inference about the students is valid?

• Girls like country music more than boys like rap music

• More girls than boys like rock music

• Boys like country music more than rock music

• Boys like rock music more than girls like rap music

Tags

inferences

bar graph

teks 7.12C

Jillian rolled a number cube 360 times. About how many times do you expect her to roll a 2?

• 20 

• 180

• 60 

• 120

Drake made 14 out of 20 free throw shots.  About how many out of the next 30 free throw shots would you expect him to make?

• 20

• 21

• 22

• 25

A poll was taken of Hobby Middle School, 25 out of 30 students said they would prefer pizza on Friday’s. Out of 1200 students, what is a reasonable prediction of how many students would prefer pizza on Fridays?

• 100

• 1000

• 10

• 1

As a part of a survey, 50 students were asked about their favorite lunch item. The results are shown below. The cafeteria manager knows that about 300 students buy lunch from the cafeteria each day. Based on the table, she predicts that 60 students will buy pizza each day. Which statement about her prediction is true.

• Her prediction is invalid because ⅕ of 50 is 10.

• Her prediction is invalid because ¼ of 300 is 75.

• Her predictions is invalid because 120% of 50 is 60.

• Her predictions is valid 20% of 300 is 60.

A bag contains:

• 5 red marbles
• 6 blue marbles
• 3 green marbles
• 4 black marbles
• 2 yellow marbles

A marble will be drawn from the bag and replaced 200 times. What is a reasonable prediction for the number of times a yellow or green marble will be drawn?

• 20

• 30

• 50

• 40