AP Stat

The graph shows the distribution of scores of 30 students on a mathematics test. Based on the histogram, which statement must be true?

• The lowest test score is 41%.

• The highest test score is 100%.

• The mean test score is between 81% and 90%.

• The median test score is not greater than 80%.

• The lower quartile of the test scores is greater than 60%.

In a certain school, students can choose whether to eat in the school’s cafeteria. A reporter working for the school’s newspaper polled students on their reactions to changes in the menu at the cafeteria. For each student leaving the cafeteria in one 20-minute time period, the reporter used a die to determine whether to stop the student and ask how he or she felt about the new menu. In the reporter’s article it was stated that a random sample of the students showed that 23% of the school’s student population was happy with the new menu. Which of the following statements is true?

• Because each student leaving the cafeteria was randomly selected and could choose to answer or not, this is a random sample of the student population, and the 23% is an accurate measurement of the school population’s view of the new menu.

• Because students self-selected whether to eat in the cafeteria, the sampling method might be biased and the sample might not be representative of all students in the school.

• The survey would have been more effective if the reporter had collected the data in one 10-minute time period rather than in one 20-minute time period.

• The survey would have been more effective if students who cared about the food could have called the reporter to tell how they felt about the new menu, so that only students with opinions on the subject would have been surveyed.

• Because no treatment was imposed on the students eating in the cafeteria, one cannot make any conclusions about the new menu.

The boys and girls basketball teams at a high school had their heights measured at practice. The following data was recorded for their heights. What can you conclude from the distributions?

• The girls have a larger median and a larger range in heights.

• The boys had a smaller median height than the girls; however, the boys had a larger range of heights.

• The median height for the boys and the girls is the same; however, the girls have a larger range.

• The median height for the boys is larger; however, the girls have a larger range.

• No information can be concluded from the distribution since there is no key included.

Use the table to answer the following question. Of the male subjects in the study, what fraction drive a sports car?

• 39/84

• 39/240

• 39/60

• 60/240

• 84/240

Identify the shaded area...

• A

• B

• A'

• B'

Identify the shaded area...

• A∩B

• A∪B

• A'∩B'

• A'∪B'

Identify the shaded area...

• A∩B

• A∪B

• A'∩B'

• A'∪B'

Identify the shaded area...

• A∩B

• A∪B

• A'∩B'

• A'∪B'

Probability can be expressed as a number between_____ and _____.

• 0 and 100

• 0 and 10

• 0 and 1

• -1 and 1

What is the probability of rolling a cube and having land as an odd number?

• 3/4

• 1/3

• 1/2

• 2/5