A stem-and-leaf display includes the following row: 3 | 0 1 3 5 7 9. Assume that the data are rounded to the nearest whole number. Which of the following statements is true?
A)The frequency of the class is 7.
B)The minimum value in the class is 0.
C)The maximum value in the class is 39.
D)The class interval is 5.

Question

Quizplus · Accepted Answer

In a stem-and-leaf display, the stem represents the tens digit and the leaf represents the ones digit. So, the stem here is 3 and the leaf shows the ones digit of each value. From the given stem-and-leaf display, we can see that the largest value in this group is 39 (which corresponds to stem 3 and leaf 9), and the minimum value is 30 (which corresponds to stem 3 and leaf 0). Since the data are rounded to the nearest whole number and all the values have the same ones digit, we can assume that each leaf represents only one value. Therefore, the frequency of the class is simply the number of values in this group, which is 6. So, statement A is false. Also, the class interval is the difference between consecutive stems, which is 1 in this case. So, statement D is false. The correct answer is C, as the maximum value is 39.

A Stem-And-Leaf Display Includes the Following Row: 3 | 0