Line Plots
Create a line plot for the following data and show how many students read exactly 2 books:
0, 3, 2, 1, 1, 2, 2
3 students read 2 books
For the data set 12, 14, 15, 17, 26, 28, 31, make a stem-and-leaf plot. (Stem = tens, leaf = ones)
1|2 4 5 7
2|6 8
3|1
Find the mode of this data set: 4, 4, 5, 6, 7
4 (shows up twice)
Find the range of: 6, 9, 12
12 - 6 = 6
Which measure best describes the "most common" number in a list: mean, median, or mode?
Mode
A line plot shows measurements (in inches): 3, 4, 4, 5, 5, 5. Draw or describe how the line plot would look (where the dots go). How many dots go above 5?
3 dots/x's above 5
Create a stem-and-leaf plot for these numbers: 21, 22, 25, 27, 30. Then identify the smallest value.
2|1 2 5 7
3|0
The smallest value is 21
Find the median of the data set: 3, 5, 7, 9, 11.
7 (in the middle)
The temperatures over three days: 68°F, 72°F, 70°F. What is the range?
70 - 68 = 2
For the list 2, 2, 3, 4, 5, which measure would you use to find the middle value? What is it?
Median
Median: 3
A line plot shows the number of pets students have: 0, 1, 1, 1, 2, 2, 2, 2, 3, 3. What is the total number of students represented on the plot?
10 students
Use a stem-and-leaf plot to show the data: 33, 36, 36, 38, 41. What is the median?
3|3 6 6 8
4|1
Median: 36
Find the median and mode of the data set: 2, 2, 3, 4, 5, 5, 6.
Median: 4 (in the middle)
Mode: 2 and 5 (shows up twice each)
Find the range of these scores: 55, 78, 62, 80, 71.
80 - 55 = 25
A data set: 10, 12, 15, 15, 18. Find mode and range.
Mode: 15 (shows up twice)
Range: 18 - 10 = 8
A line plot records jump rope counts: 10, 12, 12, 12, 14, 15, 15, 15, 15. What is the mode and how many times does it appear?
15 is the mode. It shows up 4 times.
Given this stem-and-leaf plot:
2|1 3 5
3|0 2 2 4
4|1
Write the full list of numbers and find the mode.
21, 23, 25, 30, 32, 32, 34, 41
Mode: 32
The data set is: 8, 10, 10, 12, 14, 14, 14, 16, 18. What is the median and the mode?
Median: 14 (in the middle)
Mode: 14 (shows up three times)
A set of measurements: 2.5, 3.0, 4.0, 2.0, 3.5. What is the range?
4.0 - 2.0 = 2.0
Explain why median is a good measure to use for this data set: 2, 2, 3, 4, 100.
Because the median is still a short number (3) and isn't affected by the 100
Students measured seed lengths (in inches) and made a line plot with halves: 1, 1.5, 2, 2, 2.5, 2.5, 3. How many students measured less than 2 inches? Use the line plot to explain your answer.
2 students (1 and 1.5)
A stem-and-leaf plot shows student scores:
5|0 2 2 8
6|1 3 9
List all scores and calculate the median and range.
50, 52, 52, 58, 61, 63, 69
Median: 58
Range: 19
A teacher records the number of books read by 9 students: 0, 1, 1, 2, 3, 3, 4, 4, 7. Find the median and mode. If the teacher wants the class goal to be above the median, what should the target number of books be?
Median: 3 (in the middle)
Mode: 1, 3, 4 (all show up twice)
The target # should be > 3
In a school field test, student times (in minutes) were: 4.2, 3.8, 5.0, 4.5, 4.2. What is the range? If the slowest time (largest) was removed, what would the new range be?
5.0 - 3.8 = 1.2
4.5 - 3.8 = 0.7
You are given a line plot of shoe sizes: 3, 4, 4, 4, 4, 5, 5, 6, 6, 6
Find the mode, median, and range. Show how you compute each.
Mode: 4 (shows up 4 times)
Median: 5 (in the middle)
Range: 6 - 3 = 3