Download Holt Geometry 3-1

3-1 Lines and Angles
Paper for notes
Pearson 11.10
Graphing Calc.
Holt Geometry
3-1 Lines and Angles
TOPIC:
Name: Daisy Basset
Date :
Period:
11.10
Normal
Distributions
Objective:
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Notes
Use the mean and
standard deviation
of data set and
fit it to a normal
distribution.
3-1 Lines and Angles
Vocabulary
 Discrete Probability
Distribution
 Continuous Probability
Distribution
 Normal Distribution
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3-1 Lines and Angles
Notes 11.10
Graphing Calc.
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1. The bar graph
gives the
weights of a
population of
female brown
bears.
3-1 Lines and Angles
Holt Geometry
3-1 Lines and Angles
The red curve,
shows the weights
are normally
distributed about
the mean, 115 kg.
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3-1 Lines and Angles
Approximately what
percent of female
brown bears weigh
between 100 and
129 kg?
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3-1 Lines and Angles
The percents for each bar are
based on the same sample
population of bears. You can
add the percents.
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3-1 Lines and Angles
(100–109) + (110–119) + (120–129)
23 + 42 + 23 = 88
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3-1 Lines and Angles
About ____
88% of the
female brown bears
weigh between 100
and 129 kg.
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3-1 Lines and Angles
2. For a population of
male European eels,
the mean body
length and 1
positive and
negative standard
deviation is shown.
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Sketch a normal
curve showing the
eel lengths at one,
two, and three
standard deviations
from the mean.
3-1 Lines and Angles
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3-1 Lines and Angles
Measure
Mean
+1 
-1 
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Length (in.)
15.7
18.5
12.9
 = 18.5 - 15.7
= 2.8
Lines and Angles Length (in.)
3-1Measure
Mean
+1 
-1 
+2 
-2 
+3 
-3 
Holt Geometry
15.7
15.7
15.7
15.7
+
+
-
2(2.8)
2(2.8)
3(2.8)
3(2.8)
15.7
18.5
12.9
= 21.3
= 10.1
= 24.1
= 7.3
3-1 Lines and Angles
Holt Geometry
3-1 Lines and Angles
3. The heights of adult
American males are
approximately
normally distributed
with mean 69.5 in.
and standard
deviation 2.5 in.
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A. What percent of
adult American
males are
between 67 in.
and 74.5 in.
tall?
3-1 Lines and Angles
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3-1 Lines and Angles
34% + 34% + 13.5%
= 0.34 + 0.34 + 0.135
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3-1 Lines and Angles
81.5% of
About _____
the adult American
males are between
67 in. and 74.5 in.
tall.
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B. In a group of 2000
adult American
males, about how
many would you
expect to be taller
than 6 ft. (72 in.)?
3-1 Lines and Angles
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3-1 Lines and Angles
13.5% + 2.35%
= 0.135 + 0.0235
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= 0.1585
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You would expect about
317
0.1585  2000 = ___
of the adult American
males to be taller than
6 ft.
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3-1 Lines and Angles
Summary
D
L
I
Q
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Summarize/reflect
What did I do?
What did I learn?
What did I find most
interesting?
What questions do I still
have? What do I need
clarified?
3-1 Lines and Angles
Hmwk 11.7 B:
Math XL
Work on the Study Plan
Test on Block day
Holt Geometry