# Mean_ Median_ Mode_ and Range by ewghwehws

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• pg 1
```									    Math Extension and Intervention
•Be on time and be respectful to others….A large
group……
•No food or drinks or popping gum
•No email, searching, or playing regular
games..Interactive math websites only
•Try to improve
•Bring pencil and paper and your calculator or you
can use the one on the computer….
• Pre-test on Monday…..Post-test on Friday
with
• Either Mean, Median, Mode and Range or
Probability
• Make sure you record your scores on both tests on
• Hope you get some Math MOOVES tickets…Good
luck
WHAT DO THEY ALL MEAN?
Mean

• Is the average of a set of
numbers.
How is the mean of a set of
numbers found?
• Add all the numbers in the set
together.
• Divide the sum by the number of
numbers in the set.
• The quotient is the mean of the
set of numbers.
• Example: 20, 15, 25
– Divide 60 by 3
– The mean is 20
Median
• Is the number that is in the middle
of a set of numbers.
• (If two numbers make up the
middle of a set of numbers then the
median is the average of those two
numbers.)
How is the median of a set of
numbers found?
• Arrange the numbers in the set in order
from least to greatest.
• The middle number is the median of a set
of numbers.
• If more than one number is in the middle
of the set of numbers, the average of
those two numbers is the median of the
set of numbers.
• Examples:
• 10, 15, 20
• 15 is the median of this set of numbers.

•   10, 15, 20, 25
•   Add 15 + 20 = 35
•   Divide 35 by 2 = 17.5
•   The median of this set of numbers is 17.5
Mode

• Is the number in a
set of numbers
that occurs the
most often.
How do I identify the mode of a set
of numbers?

• Arrange the set of numbers in order from
least to greatest.

• The number that occurs the most often is
the mode of that set of numbers.
• Example:
• 10, 15, 10, 15, 20, 25, 15, 30
• 10, 10, 15, 15, 15, 20, 25, 30

• 15 is the mode of this set of numbers because it
is the numbers that occurs the most.
Range

• Is the difference
between the
highest and lowest
numbers in a set of
numbers.
How is the range of a set of
numbers identified?

• Arrange the numbers in the set in order
from least to greatest.

• Subtract the lowest number from the
highest number in the set of numbers.

• The difference of the two numbers is the
range of a set of numbers.
• Example:

• 10, 15, 20, 25, 30, 35, 40, 45, 50

• 50 – 10 = 40

• 40 is the range of this set of
numbers.
It’s Time To Practice!
•   10 5 25 50 15 10 40 35 10 20
•   5 10 10 10 15 20 25 35 40 50
•   What is the mean?
•   What is the median?
•   What is the mode?
•   What is the range?