TRMS 7TH GRADE Inferences

The dot plot represents the number of dollars in allowance that students receive each week in Mrs. Jimenez's class. What is the median amount of allowance?

• 5

• 6

• 7.5

• 8

A grocery store polls every twentieth customer to determine if they are satisfied with the cleanliness of the store. Forty customers are surveyed and 26 are satisfied. What conclusion can be drawn for the 800 daily customers?

• 65% of the customers are unsatisfied with the cleanliness of the store.

• Of the 800 customers, 520 would be satisfied with the cleanliness of the store

• 40% of the customers are satisfied with the cleanliness of the store

A random sample of 40 students from each grade level was surveyed regarding their preference for a class field trip.

If there are 220 members of the 7th grade class, then how many students can be expected to prefer the zoo?

• 39

• 48

• 120

• 66

Compare. Which of the following statements is NOT true?

• Class B has a higher average of siblings

• Class A has a greater variability in the number of siblings

• Both Class A and Class B have students who are only children.

• Over half of the students in Class A have two or more siblings.

A middle school has 6th, 7th, and 8th grade students. Which of the following would be a random sample of the students?

• Surveying all of the teachers

• Surveying the students who buy their lunch in the cafeteria

• Surveying everyone whose last name begins with a G

• Surveying every tenth student who is on the class roster.

Which of the conclusions best supports the dot plots?

• Both Jamal and Kendall's racecars had an equal spread in their data

• On average Kendall's racecar traveled futher.

• The median of Jamal's racecar traveled was 6.5 ft.

Which of the following statements does NOT represent the data?

• The scores in Mrs. Hernandez's class have less variability than the scores in Mrs. Moore's class

• The mean of Mrs. Moore's class is equal to the first quartile of Mrs. Hernandez's class.

• The interquartile range of both classes is equal.

Seventeen out of 20 teens said they eat breakfast every morning. What is a reasonable prediction for the number of teens out of 1,280 who eat breakfast every morning?

• 256
• 448
• 1088
• other

The monthly rents for five apartments advertised in a newspaper were $650, $650, $740, $1650, and $820. Use the mean, median, and mode of the rents to answer the question. Which measure best describes the monthly rents? 

• Mean
• Median
• Mode

Mrs. Gilbert is interested in determining how many students spend 4 or more hours doing homework each week. Which of the following will give her the most random sample?

• A) Ask chorus students to take a survey about homework habits.
• B) Ask gifted/accelerated students to take a survey about homework habits. 
• C) Ask students on the boys’ basketball team to take a survey about homework habits.
• D) Ask students with an odd numbered student ID to take a survey about homework habits.