Line Plots — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Sarah measured 12 leaves for a Grade 3 line plot: 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7. What is the mode?
A) 4
B) 5
C) 6
D) 7
The number 5 appears four times, more than any other value, so the mode of the Grade 3 line plot is 5.
2. On a Grade 3 line plot of books read, 3 students read 2 books, 6 read 3 books, and 2 read 4 books. How many students total?
A) 9
B) 10
C) 11
D) 12
3 plus 6 plus 2 equals 11 students total on the Grade 3 line plot.
3. A Grade 3 line plot of plant heights in cm shows 1 X above 8, 4 X above 9, 3 X above 10, 2 X above 11. How many plants?
A) 8
B) 9
C) 10
D) 11
1 + 4 + 3 + 2 equals 10 plants total on the Grade 3 line plot of heights.
4. Sarah's Grade 3 leaf line plot ranges from 3 cm to 7 cm. What is the range of the data?
A) 3
B) 4
C) 5
D) 7
7 minus 3 equals 4, so the range of the Grade 3 leaf line plot is 4 cm.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Sarah's 12-leaf Grade 3 line plot shows 4 X above 5 cm. So 4 leaves are 5 cm long.
4 X marks above 5 cm means 4 leaves measured 5 cm on Sarah's Grade 3 line plot.
2. On a Grade 3 line plot of books, 3 students read 2 books and 6 students read 3 books. There are 3 more readers at 3 books.
6 minus 3 equals 3, so 3 more students read 3 books than 2 books on the Grade 3 line plot.
3. A Grade 3 line plot of plant heights has 4 X above 9 cm and 3 X above 10 cm. The total at 9 and 10 cm is 7.
4 plus 3 equals 7 plants at heights 9 cm or 10 cm on the Grade 3 line plot.
4. Sarah's Grade 3 leaf line plot has its tallest stack above 5 cm. So 5 cm is the mode value.
The value with the tallest stack of X marks on a Grade 3 line plot is called the mode.
5. Sarah's Grade 3 leaves range from 3 cm to 7 cm. The range is 4 cm.
7 minus 3 equals 4, so the range of Sarah's Grade 3 leaf line plot is 4 cm.