predicting with probabilites

In a random survey of 50 students at Great Middle School, 32 said chocolate was their favorite flavor of yogurt. The school has 450 students. How many of them are likely to select chocolate as their favorite flavor? 

• 144
• 162
• 225
• 288

A principal randomly chose 40 students from grade 5. Of these students, 9 were wearing watches. Based on this information, what is the most reasonable prediction of the number of students wearing watches in a group of 120 students from grade 5?

• 27
• 9
• 18
• 80

The probability of a video game being defective is 1 out of 20.  About how many video games would be defective in a shipment of 490 video games? (Round your answer to the nearest whole number.)

• 490
• 25
• 98
• 100

Tags

CCSS.7.SP.C.6

The probability of a table-tennis ball being defective is 1 out of 10 . About how many balls would be defective in a case of 725 table-tennis balls? (Round your answer to the nearest whole number.)

• 73
• 125
• 80
• 310

Tags

CCSS.7.SP.C.6

100 second graders were asked to do a book report about one of these four zoo animals.  The number of students who chose each animal is shown in the table.  If 250 second graders had to choose of of the four animals, predict how many would choose to write about a giraffe.

• 60 students
• 50 students
• 40 students
• 30 students

150 people were polled on their favorite sport.  The results are in the table.  Which statement is true?

• Baseball & swimming are more popular than football.
• Football & tennis are more popular than soccer & baseball.
• 25% of people prefer soccer & basketball.
• 10% more people prefer soccer than basketball.

150 people were polled on their favorite sport.  Based on the table, if you asked only 25 people what their favorite sport is, how many would say soccer is their favorite sport?

• 5 people
• 6 people
• 8 people
• 10 people

ESPN sportscasters voted on next year's likely Superbowl champion.  Their votes are in the table.  Which statement is true based on the table?

• The Cowboys & Raiders are equally likely to win the Superbowl next year.
• The Steelers are twice as likely as the Cowboys to win the Superbowl next year.
• The Steelers are 5% more likely to win the Superbowl than the Packers.

Three out of 24 students surveyed chose roller skating as their favorite hobby. Suppose 200 students were surveyed. How many students can be expected to say that roller skating is their favorite hobby?

• 25

• 178

• 24/200

• none of the above

Fourteen percent of students chose science as their favorite subject. If five hundred students are surveyed, how many would be expected to pick science as their favorite subject?

• 70

• 70%

• 7

• 700