6.13 A

The dot plot shows the results of a survey where people were asked the number of trips they had taken to a movie theater in the last year. Which statement best describes the data represented in the dot plot?

• A total of 10 people responded to the survey.

• There were 8 people who took 2 or fewer trips to a movie theater.

• All the people who responded to the survey took at least 1 trip to a movie theater.

• Half the people who responded to the survey took 5 or more trips to a movie theater.

The stem and leaf plot shows the ages of riders on a roller coaster. Based on the stem and leaf plot, which statement is true?

• There were more riders between 10 and 38 years of age than there were between 42 and 74 years of age.

• There were more riders 14 years of age than riders of any other single age.

• There were 31 riders on the roller coaster.

• There were exactly 3 riders over the age of 50 years.

The dot plot shows the vertical jump height for each of 10 athletes. Which statement is supported by the data in the dot plot?

• The number of athletes with a vertical jump height of 33 1/2 inches is less than the number of athletes with a vertical jump height of 37 1/2 inches and 38 inches.

• The number of athletes with a vertical jump height of 34 inches is 1/4 of the total number of athletes.

• The least number of athletes had a vertical jump height of 33 inches.

• The number of athletes with a vertical jump height of 33 1/2 inches is 1/5 of the total number of athletes.

The stem and leaf plot shows the pressure in pounds per square inch of each bicycle tire in a shop. Which statement is best supported by the data in the stem and leaf plot?

• Half of the tire pressures are 75 pounds per square inch or less.

• There are more tires with pressures from 90 to 99 pounds per square inch than with pressures from 80 to 89 pounds per square inch.

• Three times as many tires have pressures from 50 to 59 pounds per square inch as tires that have a pressure of 65 pounds per square inch.

• There are more tires with pressures from 70 to 79 pounds per square inch than with pressures from 50 to 59 pounds per square inch.

There are 160 employees who work for a company. The histogram summarizes the amount of time each employee has been in his or her current position at the company.

Based on the histogram, which statement must be true?

• There are 5 employees who have been at their current position for 30–35 months.

• There are 6–11 employees who have been at their current position for 15 months.

• Half of the employees have been at their current position 18 or more months.

• Half of the employees have been at their current position 11 or fewer months.

The box plot summarizes the finishing times for the runners in a race. Which statement is best supported by the data in the box plot?

• Approximately 50% of the finishing times were less than 25 minutes.

• Approximately 1/4 of the finishing times were greater than 28 minutes.

• Approximately 25% of the finishing times were in the interval 20–22 minutes.

• Approximately 3/4 of the finishing times were in the interval 15–30 minutes.

The dot plot shows the wing lengths in millimeters for ten birds.

• More than half of the birds have wing lengths of less than 50 millimeters.

• There are more birds that have a wing length of 54 millimeters than birds that have a wing length of 46 millimeters.

• Fewer than half of the birds have wing lengths greater than 48 millimeters.

• There are more birds that have a wing length of 52 millimeters than birds that have a wing length of 51 millimeters.

The stem and leaf plot shows the percentage of questions on a Spanish test that were answered correctly by each student in a class.

• Nine students answered 55% of the questions correctly.

• Half the students answered 70% or 75% of the questions correctly.

• Eight students answered more than 80% of the questions correctly.

• Ten students answered 100% of the questions correctly.

The box plots summarize the attendance for the spring musical and the fall musical. Each musical was performed for six evenings.

Which statement best describes the data represented in the box plots?

• The range in attendance for the fall musical is 85.

• The interquartile range for the spring musical is 45.

• For half the evenings at the fall musical, the attendance was less than 160 people.

• For half the evenings at the spring musical, the attendance was between 155 and 200 people.

The total number of items sold by each student who participated in a fund-raiser is shown in the stem and leaf plot. Which statement is best supported by the data in the stem and leaf plot?

• The number of students who sold between 10 and 20 items is greater than the number of students who sold more than 40 items.

• The number of students who sold more than 30 items is greater than the number of students who sold fewer than 30 items.

• The most common number of items sold is 30.

• The most common number of items sold is 15.