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AP STATISTICS
LESSON 1 – 2
( DAY 1)
Describing Distributions with
Numbers
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View Full Document Essential Question
:
What are the measures of
center, when and how are
they used?
To find the mean of a data set
To find the median of a data set
To compare the mean and the median of
data set
The Mean X
To find the mean of a set of
observation, add their values and
divide the number of observations
are x
1
+ x
2,
+ x
3
, …….
.+ x
n,
, their
mean is
x = x
1
+ x
2
+ ………+ x
n
or in more compact notation
x = 1
∑ x
i
n
n
∑  ( capital
letter sigma )
In the formula
for the mean
is short for
“ add them all
up”
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View Full Document Input the following data
sets into your calculator:
Aaron’s
13, 27, 26, 44, 30, 39, 40, 34, 45, 44, 24, 32, 44, 39, 29,
44, 38, 47, 34, 40, and 20.
Bond’s
16,19, 24, 25, 25, 33, 33, 34, 34, 37, 37, 40, 42, 46, 49,
and 73.
Ruth’s
54, 59, 35, 41, 46, 25, 47, 60, 54, 46, 49, 46, 41, 34, and
22
Warm – up
Describe or write a
formula for the mean and
median of a data set.
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View Full Document The Median
M
The median
M
is the midpoint of a distribution, the
number such that half the observations are smaller and
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This note was uploaded on 05/25/2010 for the course MATH 1231 taught by Professor Dr.driscoll during the Spring '10 term at Clayton College of Natural Health.
 Spring '10
 Dr.Driscoll
 Statistics

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