STATISTICS
(DISPLAYING DATA)
A graph is a visual representation of data that displays the more
relationship among the variables. Graphs can present data
clearly and concisely than a table or written text.
Data can be numerical or categorical (types).
continuous data:
data that can have any numerical value
within a finite or infinite interval
ex.
discrete data:
data that are distinct and can be counted
ex.
A histogram or line graph may be used to display continuous data.
A bar graph or circle graph may be used to represent discrete data.
Unit 8 Lesson 3
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Example 1:
26
70
a)
63
43
A math class had the following grades on a test out of 100:
73
92
82
64
32
75
73
46
35
64
63
23
56
67
87
52
40
28
51
76
55
56
Starting with the interval 20–29, 30–39, etc., create a frequency table.
Grades
20 – 29
30 – 39
40 – 49
50 – 59
60 – 69
70 – 79
80 – 89
90 – 100
Tally
Frequency
b)
Use the frequency table to create a histogram.
c)
State which interval has the greatest frequency.
d)
Determine what percentage of the class received an “A” (80% or higher).
Homework:
p.125–128 #1–6, 11
Unit 8 Lesson 3
Page 2 of 2