Practice Line Plot (Dot Plot) in Statistics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A line plot (also called a dot plot) is a diagram that displays data values as marks — usually X's or dots — stacked above their corresponding values on a number line. Each mark represents one data point, making it easy to see the frequency of each value.
Imagine a number line where every time someone picks a number, you stack an X above it. Taller stacks mean more people chose that number. You can quickly see which values are popular.
Example 1
easyStudents measured the lengths of 10 leaves (in cm): 5, 6, 5, 7, 6, 5, 8, 6, 7, 5. Create a line plot (dot plot on a number line) for this data.
Example 2
mediumA line plot shows the number of hours students spent on homework: 1 hour (2 dots), 1.5 hours (4 dots), 2 hours (5 dots), 2.5 hours (3 dots), 3 hours (1 dot). Find the total number of students and the total hours spent by all students combined.
Example 3
mediumA line plot shows the weights of 12 apples in fractions of a pound: \frac{1}{4} (3 dots), \frac{1}{2} (5 dots), \frac{3}{4} (3 dots), 1 (1 dot). What is the mean weight of the apples?
Example 4
hardTwo classes made line plots of their test scores. Class A: 70 (1), 75 (3), 80 (6), 85 (4), 90 (1). Class B: 60 (2), 70 (3), 80 (5), 90 (3), 100 (2). Compare the centres and spreads of the two distributions.