Practice #1 Sophia is a student at Windsfall High School. These histograms give information about the number of hours spent volunteering by each of the students in Sophia’s homeroom and by each of the students in the tenth-grade class at her school. a) Find the medians and quartiles for the 2 groups.

Practice #2 Old Faithful, a geyser in Yellowstone National park, is renowned for erupting fairly regularly. In more recent times, it has become less predictable. It was observed that the time interval between eruptions was related to the duration of the most recent eruption. The distribution of its interval times for 2011 is shown below. Does the distribution seem normal, skewed, or uniform? What does the distribution tell you about the time between eruptions?

Practice #3 The top five salaries and bottom five salaries at Technology Incorporated are shown in the table below. Find the mean absolute deviation for each set of data. Round to the nearest hundredth. b) Compare the variations of the data sets. 7.46, 2.14

Practice #4 A science teacher recorded the pulse rates for each of the students in her classes after the students had climbed a set of stairs. She displayed the results, by class, using the box plots shown. Which class had the highest pulse rate after climbing the stairs? C

Practice #5 A teacher determined the median scores and interquartile ranges of scores for a test she gave to two classes. In Class 1, the median score was 70 points, and the interquartile range was 15 points. In Class 2, the median score was 75 points, and the interquartile range was 12 points. Which range of numbers includes only third quartile of scores for both classes? 70 to 87 points 70 to 85 points 75 to 87 points 75 to 85 points D