Line Plots — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A Grade 3 line plot of teeth lost shows 2, 5, 4, 1 Xs above 0, 1, 2, 3. The mode is 1.
The mode is the value with the tallest stack of Xs, and 5 is the largest count, which sits above the value 1.
2. A Grade 3 line plot has 3 Xs above 2 cousins and 7 Xs above 4 cousins. There are 4 more above 4.
To find how many more above 4 than 2, subtract: 7 minus 3 equals 4, so 4 more students chose 4 cousins.
3. A Grade 3 line plot shows 1, 1, 1, 1 Xs above 0, 1, 2, 3 hours. The total surveyed is 4.
When each column has one X, the total surveyed is the sum: 1 plus 1 plus 1 plus 1 equals 4 students.
4. If a Grade 3 line plot of pets shows 0 Xs above 5 pets, then 0 students own 5 pets.
Zero Xs above a value means no one in the data had that count, so 0 Xs above 5 pets means no students own 5 pets.
5. A Grade 3 line plot has Xs above 1, 2, and 3 only. The range of values is from 1 to 3.
Range looks at the smallest and largest scale values that have Xs, which are 1 and 3 on this line plot.
6. On a Grade 3 line plot, if 9 students were surveyed and 4 chose 2 hours, then 5 chose other amounts.
Subtract the column count from the total surveyed: 9 minus 4 equals 5 students who chose other amounts of hours.
7. A Grade 3 line plot shows 6 Xs above 1 sibling and 6 Xs above 2 siblings, so 1 and 2 are both modes.
When two values have the same tallest count of Xs, both values are modes because both happen most often in the data.
8. If a Grade 3 line plot has 12 total Xs and 3 columns with 4 Xs each, the line plot shows 3 values.
Each column with Xs is one value used in the data, so 3 columns of 4 Xs each gives 3 different values.
9. A Grade 3 line plot of minutes has 2 Xs above 5 and 5 Xs above 10. There are 7 Xs in all so far.
Total Xs is the sum of every column: 2 Xs above 5 plus 5 Xs above 10 equals 7 Xs counted so far.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Two columns with equal tallest Xs on a Grade 3 line plot
→ Two modes
Two modes
Difference between two columns on a Grade 3 line plot
→ How many more or fewer
How many more or fewer
Empty column on a Grade 3 line plot
→ Zero data points there
Zero data points there
Sum of every column on a Grade 3 line plot
→ Total students surveyed
Total students surveyed
Equal tallest stacks make two modes, column differences show how many more, empty columns mean zero, and adding all columns gives the total students.