Percents And Probability Worksheet With Answers - Lesson 12-19 Page 21
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49Anthony interviewed classmates to determine their preference
examPle 2
for sweets. he made the following pie chart.
Hard
Find the probability someone will prefer chocolate.
Candy
Chocolate
15
27
s
Total number of students interviewed.
27 + 15 + 18 = 60
Chewy
olution
Candy
18
27 __
= 9 __
P(prefer chocolate)
60
20
9 __
Th e probability someone will prefer chocolate is
or 0.45 or 45%.
20
Erin measured 20 random classmates to fi nd their height. She recorded the information in inches.
height (inches)
58
59
60
61
62
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66
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70
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73
number of students
1
0
3
2
1
0
0
4
2
0
4
1
0
1
1
0
histogram
A
is a type of bar graph. It has equally sized intervals of data. Th e height of each bar in the
frequency
histogram is the
or number of times the data occurs in that interval.
For example, in Erin’s data above, let each interval include 4 inches. Start at the lowest height (58 inches).
height (inches)
Frequency
58-62
6
62-66
5
66-70
7
70-74
2
Th is data can be displayed in a histogram. Bars drawn to represent the data touch each other. Th e height in
inches is listed on the horizontal axis and the number of students is on the vertical axis.
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2
1
0
58
62
66
70
74
Height in Inches
91
Lesson 15 ~ Probabilities And Data Displays
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