Mathematics
Grade 7
15 min
Interpret line plots
Interpret line plots
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify the components of a line plot.
Determine the frequency of data points on a line plot.
Calculate the range of data from a line plot.
Identify clusters, gaps, and outliers on a line plot.
Determine the mode (peak) of a data set from a line plot.
Answer specific questions and draw conclusions based on line plot data.
Ever wonder how many hours your classmates spend on homework or playing sports? 📊 Line plots help us visualize and understand this kind of information quickly!
In this lesson, you'll learn how to read and make sense of line plots, which are simple graphs that show the frequency of data along a number line. This skill is crucial for analyzing data in everyday life and in more advanced mathematics.
Real-World Applications
Track...
2
Key Concepts & Vocabulary
TermDefinitionExample
Line PlotA graph that displays the frequency of data along a number line. Each data point is represented by an 'X' or a dot stacked above its corresponding value on the line.A line plot showing the number of pets students have, with 'X's above 0, 1, 2, 3, etc., indicating how many students have that many pets.
Data PointA single piece of information collected in a study or experiment. On a line plot, each 'X' represents one individual data point.If a student has 2 pets, '2' is a data value, and an 'X' would be placed above '2' on the line plot to represent that student's data.
FrequencyThe number of times a particular data value appears in a set of data. On a line plot, it's the count of 'X�...
3
Core Formulas
Reading Frequency from a Line Plot
$\text{Frequency(value)} = \text{Number of 'X's above value}$
To find out how many times a specific data value occurred, simply count the number of 'X's stacked directly above that value on the number line.
Calculating the Range of Data
$\text{Range} = \text{Highest Data Value} - \text{Lowest Data Value}$
To determine the spread of the data, identify the largest data value (the rightmost 'X') and the smallest data value (the leftmost 'X'), then subtract the smallest from the largest.
Identifying the Mode (Peak)
$\text{Mode} = \text{Value with Max(Frequency)}$
The mode is the data value that appears most often. Find the value on the number line that has the tallest stack of 'X's above...
5 more steps in this tutorial
Sign up free to access the complete tutorial with worked examples and practice.
Sign Up Free to ContinueSample Practice Questions
Challenging
A line plot shows the number of siblings for 25 students: 0(3X), 1(8X), 2(7X), 3(4X), 4(2X), 8(1X). What percentage of students have fewer than 2 siblings?
A.11%
B.32%
C.44%
D.56%
Challenging
The line plot shows the number of books read by 20 students in a month: 0(2X), 1(3X), 2(5X), 3(6X), 4(3X), 5(1X). What is the total number of books read by all students combined?
A.20
B.48
C.53
D.6
Challenging
A line plot shows daily push-ups: 10(1X), 12(2X), 15(4X), 16(5X), 18(4X), 20(3X), and an outlier at 35(1X). If the outlier is removed from the data set, by how much does the range decrease?
A.10
B.15
C.20
D.25
Want to practice and check your answers?
Sign up to access all questions with instant feedback, explanations, and progress tracking.
Start Practicing Free