Line Plots: Homework

Find the range, build the number line, count the Xs, and spot the outlier.

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Part A — Range and the Number Line / 5

The range is the greatest value minus the least. A number line has to reach both ends.

1.
Find the range: 14, 3, 9, 21, 8Answer
2.
Find the range: 40, 75, 55, 90, 60Answer
3.
Data: 12, 7, 15, 9, 10. A number line has to reach the least and the greatest value. What are they?LeastGreatest
4.
A number line runs from 20 to 60 and counts by 5. How many marks does it have?Answer
5.
A number line runs from 0 to 100 and counts by 10. How many marks does it have?Answer

Each row of the table tells you how many Xs are over a number.

Number	0	1	2	3	4	5	6
Xs	1	3	5	2	0	0	1

Each problem has a mistake or a trap in it.

1.
The data is 8, 8, 8, 11. A student draws one X over the 8. How many Xs should be over the 8?Answer
2.
Find the outlier: 31, 29, 33, 30, 2, 32Answer
3.
Eli's friend says a line plot has to start at zero. Is that right? Type yes or no.Answer
4.
A student leaves 4 and 5 off a number line because nobody picked them, and the data runs from 3 to 8. What is wrong with that?Answer

Count the letters in the English name of each day. The table is real.

Write your answer in a sentence or two.

1.
Write a set of eight numbers that has one cluster and one outlier. Say where each one is.Answer
2.
How is a line plot like a bar graph, and how is it different?Answer

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Notes

Part A — the answers.

Part B — the answers.

a. 12 b. 2, the tallest stack. c. 6, far from the rest. d. From 1 to 3. e. 3 (two 3s and one 6)

Part C — the answers.

3. Every value gets its own X.
2. It is far below the others.
No. Unlike a line graph, a line plot only needs to reach the least and the greatest value.
Answers vary. Every number from the least to the greatest stays on the line, even the empty ones, or the plot gives a false picture of how far apart the values are.

Part D — the answers.

a. 3 b. 6, which appears three times. c. 2 (Thursday and Saturday) d. 9, Wednesday.

Part E — one correct answer, and what a good explanation says.

Answers vary. One that works is 5, 6, 6, 7, 7, 7, 8, 30: the cluster runs from 5 to 8 and 30 is the outlier.
Answers vary. Both show how many times each value shows up with a stack, but a line plot stacks Xs over a number line, so it shows the exact values, while a bar graph usually shows categories with bars.