9th Grade ISASP - Statistics and Probability

At a miniature golf course, a bucket of balls contains 7 blue, 14 red, 10 green, and 6 yellow golf balls that are all the same size and shape. One golf ball will be randomly drawn from the bucket. What is the probability the golf ball will be either red or yellow?

Mr. Thompson used a box-and-whisker plot to display the scores of his 20 students on a mathematics game. Which of the following can the students conclude with certainty from the box-and-whisker plot?

• What each score was

• What the mode was

• What the mean score was

• What the highest score was

• What the tenth highest score was

A collection of data is shown in the scatterplot.

Which value is the best estimate of the correlation coefficient of a line of best fit for the data?

• -0.9

• -0.09

• 0

• 0.08

• 0.8

• Week 1

• Week 2

• Week 4

• Week 5

• Week 6

The librarian at a local school collected data on the number of students using the library after school each week during the first 22 weeks of school. The librarian counted the number of students in the library each day and then calculated the total for each week. The weekly totals were plotted in a graph and then a trend line was fit to the data.

For which week does the trend line underpredict the number of students using the library by the greatest amount?

• week 3

• week 5

• week 10

• week 15

• week 22

A random sample of 200 teenagers participated in a taste test. Each teenager sampled four choices of fruit drink (labeled A, B, C, and D), and then were asked to pick a favorite. The table shows the results of this taste test.

Based on the information given, which of the given statements are true?

• 40% of the participants were girls.

• 70% of the participants preferred A.

• The proportion of boys who preferred C is equal to the proportion of girls who preferred C.

• The proportion of boys who preferred A is equal to the proportion of girls who preferred D.

A community college offered 3 music classes last semester. A total enrolled in one or more of of the classes. The Venn diagram below shows the number of students enrolled in each of the classes.

One of the students who enrolled in at least one of them music classes last semester will be selected at random for a free class. To the nearest hundredth, what is the probabilty the selected student was not enrolled in the guitar class?

• 0.25

• 0.38

• 0.60

• 0.65

• 0.75

A community college offered 3 music classes last semester. A total of 63 students enrolled in one or more of of the classes. The Venn diagram below shows the number of students enrolled in each of the classes.

What was the total number of students enrolled in only 1 of the music classes last semester?

• 3

• 12

• 15

• 48

• 60