Math Making Inferences

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.

• 25% of the customers are not satisfied with the cleanliness of the store.

Mr. Fisk, Ms. Martinez, and Mrs. Smeltzer, gathered every 6th grade math score on the test they took, which is shown in the box plot above. What is the median score the 6th grade students received?

• 64

• 70

• 84

• 72

Students record the number of minutes they read at home.  The box plot shows the summary of the results.  Which statement best describes the data? 

• A quarter of the students read for 30-40 minutes.

• The interquartile range is 30.

• About half the students read for 50 minutes or more.

• The average number of minutes read was 47.

What is the interquartile range (IQR)?

• 4

• 64

• 60

• 8

Based on the box plot, which statement is NOT true?

• The oldest team member is 24.

• The median age is 22.

• Fifty percent of the participants are older than 22.

• Less than 25% of the participants are 20 or younger.

The box plot below shows the number of siblings in Mrs. Hines’ class. Which of the following statements is not true?

• The interquartile range of the data is approximately 2.

• The median number of siblings in Mrs. Hines' class is approximately 1.75.

• There is at least one student who has no siblings.

• Over half of the students in Mrs. Hines' class have two or more siblings.

The dot plot below represents the number of dollars in allowance that students receive each week in Mrs. Jimenez's class. Which of the following statements is the best descriptions for the data?

• The data is spread out and skewed left.

• Most of the data is far from the median and is skewed right.

• The data is symmetrical and close to the median.

• The data is spread out with $5 being the most common weekly allowance.

Which interval has the greatest number of employees?

• 11-21

• 33-43

• 77-87

• 44-54

Which of the following statements about the data in the histogram is true?

• A total of 30 teams were included in the data.

• Over half of the teams made 26-30 field goals in the season.

• There were 13 teams that made between 21-25 field goals during the season.

• A total of 18 teams made 25 or more field goals.

On a youth soccer team 3 out of the 12 team members have played in previous years. Based on this information, if 150 kids are in the youth soccer league, then how many could be expected to have played the year before?

*NOTE: enter your answers as a number ONLY.