Reading Data Displays
Line Plots, Histograms, Box Plots
Describing the Data:
How many students responded to the question? 24 people responded.
4
No one has more than ______
pets.
How many students do not have any pets?
4
What is the most common number of pets that people have?
Most of the people have two pets.
Describing the Data:
How many prices are represented on the graph? 16
What is the unit of measurement used? $$$$$$$$$$$$$$$$$$$
What is the median? $42.50
What does this mean?
$50.00 than any other price.
More cowboy hats cost ________
Half of the prices are above/below this price.
What is the range of these hats? $45.00
No median?Only
YES!!
by $2.50 mean ?______
Are there any outliers? Yes, $75 Would this affect the mode? _____
_____
Fourteen council members participated in the magazine sale.
Median:
20
Mode:
20
What else can you say about the data using
the graph?
Two people sold 25. No one sold 19, 21, or 22 magazines.
The fewest sold was 17. The most anyone sold was 25.
Range:
Outliers:
25-17 = 8
There are none.
What is being measured on this histogram?
What units are used?
Time trials of Olympic cyclists……..minutes are the unit used.
Which interval has 7 cyclists?
65-69 minutes
Which interval represents the greatest number of cyclists?
More finished in 60-64 minutes than any other time interval.
How many cyclists had a time less than 70 minutes?
16
9
5
8
3
What information is shown on the graph…what units are used for comparison?
Sales of 6th and 7th grade students (we don’t know what was sold) measured in dollars
About how many students from both grades earned $600 or more?
About 25 from both grades
Which grade had more students earn between $400 and $599?
Sixth grade
The box plot shows a range of car speeds for a certain period of time.
Half of the drivers were driving faster than what speed?
Half of the drivers were driving faster than 25 mph.
What was the lowest speed recorded?
19 mph
What does the box’s length tell about the data?
The top two halves are more spread out over a greater number of speeds. The lower half
of the data is closer together.
What percent of the drivers were going faster than 34 mph?
25% of the drivers were going over 34 mph.
Median:
70
Q1:
50
Q3:
140
IQR:
90
Extremes:
425 and 20
What measure would best represent this data?
The lower half of the fruits have calorie counts within 50
calories of each other.
Any other observations?
What was the greatest test score?
96
Why is the median not in the middle of the box?
The median represents the middle of the
scores, not the middle of the box.
What percent of the scores were between 71 and 96?
Half of the scores were higher than what score.
82
Do you think 60 is an outlier??????
75%
Summary……..
• What can the shape of the data on a graph tell you about the data
itself????