# Module Mean Median Mode and Range by MikeJenny

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```									         Math 7 Directions:
1.   Find your new seat using the seating chart
found on the board.

   You may RECYCLE any materials from Module 1,
2, 3, and 4!

   All that should be left in your binder should be
binder tabs for Module 5, 6, and 7.

   Stay organized!
Mean, Median, Mode and
Range

We are learning to…analyze how adding another piece
of data can affect the measures of center and spread.

Monday, December 27, 2010
Class Record Chart for Head Circumference Size
(to the nearest centimeter)
Organize this data in a:
Stem and Leaf Plot

Key:
Mean
   Mean:

   A measure of center, also known as
average.

   Mean is the sum of a set of data
divided by the number of data
items.
Median
   Median:

   A measure of center, that tells the middle number
in a set of data.

   If there is no single middle item, the number
halfway between the two data items closest to the
middle is the median.

   Basically…just find the mean of the two middle
numbers.
Mode
   Mode:

   A measure of center for a set of data that tells the
item(s) that appear most often in data set.

   There can be no mode.

   There can also be more than one mode
Range
   Range:

   The difference (subtraction) between the
greatest data value and least value in a data set.
Analyzing Measures of Center

   Which MEASURE OF CENTER
(mean, median, or mode) best
represents our data? Explain your
reasoning below in complete
sentences.
How do Outliers Data
Measurements?
   Predict: What if someone with a head
circumference of 100 cm came into our
class. How would this affect our data?
   How would this change the mean?
   How would this change the mode?
   How would this change the median?
   How would this change the range?
   Discussion Question:
   Which data measurement would be most
affected by the addition of the outlier? WHY?
Which of the following statements is true about the
data displayed in the Stem-and-Leaf Plot below?
0      5   8   9
1      2   4   5 7 9
2      4   8   8 8            Key:                                                     19
3      0   0   3        1     7 = 17

A.   The mode for the set of data is 30.
5
B.   The median for the set of data is 24.
2
0
C.   The mean for the set of data is 20.

.

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The range of the set of data is 3.

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Mr. Cain has recorded the scores on his latest test in the stem and leaf
plot below. He needs to report his test scores to Mrs. Green using a
measure of center. Which of the following measurements should Mr. Cain
use if he wants to report the highest measurement?
14
5
6       5   5   5   5
10
7       0   7
8       4   8
9       1   6                     Key:
10      0   0   0             1   7 = 17                                  2
A.    Mean                                                                                    1
B.    Median

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They are all the same!

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```
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