Mean_ Median_ Mode_ and Range by ewghwehws

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									    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
• Score on Pre-test will determine what we help you
  with
• Either Mean, Median, Mode and Range or
  Probability
• Make sure you record your scores on both tests on
  your paper
• 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
  – Add 20+15+25=60
  – 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?
•   The answer is 10.
•   What is the median?
•   The answer is 17.5
•   What is the mode?
•   The answer is 10.
•   What is the range?
•   The answer is 45.

								
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