Statistics Study Guide

Tony's scores on his first 4 science tests were 55, 85, 68, and 77. To the nearest whole number, what is the mean of these scores?

• 48

• 55

• 69

• 50

Find the median of the data set: 3, 36, 23, 37, 45, 5, 49, 27, 48

• 36

• 34

• 30.2

• 38

• 45

Find the mode of the data set: 11, 19, 16, 12, 19, 16, 11, 12, 16, 13

• 15

• 14

• 19

• 16

The line plot below represents the number of letters written to overseas pen pals by the students at Leander Middle School. Each x represents 10 students. How many students wrote more than 6 and fewer than 20 letters?

• 240

• 230

• 220

• 250

Thirteen bowlers were asked what their score was on their last game. The scores are shown below: 190, 150, 154, 194, 182, 190, 170, 151, 190, 170, 178, 161, 180. Find the range of the bowlers’ scores.

• 44

• 34

• 56

• 23

Make a line plot for the set of data: 61, 58, 57, 64, 57, 59, 67, 64, 58, 56, 57

• Option A

• Option B

• Option C

• Option D

Make a box-and-whisker plot for the set of data: 21, 21, 22, 20, 13, 13, 27, 24

• Option A

• Option B

• Option C

• Option D

The box-and-whisker plots show data for the test scores of four groups of students in the same class. Which plot represents data with the greatest range of scores?

• Plot A

• Plot B

• Plot C

• Plot D

Use the two box-and-whisker plots shown below to determine which of the following statements is true.

• They both have the same median.

• The upper quartiles are equal.

• The range is the same for both sets of data.

• The lower quartiles are equal.

A student at a large high school is planning to survey students about their favorite cafeteria meal. Which of the following would ensure the survey is valid?

• choose a sample that represents the student population

• only ask ninth graders to participate in the survey

• only ask students about your favorite foods

• only ask friends about their food choices