Mean, Median, Mode

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Mean, Median, Mode Range

• Part 1

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Definitions

• Mean
• Median
• Mode
• Range

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Mean

• Mean - Average
• The average of a set of numbers.
• Example
• 5, 7, 6, 5, 10, 9
• The mean (average) 7

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How to Calculate the Mean

• Step 1 Add all of the numbers in the set.
• 5 7 6 5 10 9 42
• Step 2 Divide the sum of the set by the number
  of integers in the set.
• ____
• 6 ) 42 7

Mean
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Median

• Median the middle number in a set of ordered
  integers.
• Example
• 2, 5, 6, 8, 9
• Median 6

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How to Calculate the Median

• Step 1 Arrange set of numbers from smallest to
  largest.
• 7, 5, 3, 6, 8, 5, 9
• 3, 5, 5, 6, 7, 8, 9
• Step 2 Find the middle number.
• 3, 5, 5, 6, 7, 8, 9
• 6

Median
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More Median

• Step 3 If there is an even number of integers
  you will not be able to use the middle number.
  You will need to find the 2 middle numbers, add
  them together and then divide by 2.
• 3, 3, 4, 4, 6, 7, 8, 9
• 4 6 10
• ___
• 2 )10 5

Median
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Mode

• Mode The integer that occurs the most within a
  set.
• Example
• 5, 7, 6, 5, 10, 9
• The mode 5

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How to Calculate the Mode

• Step 1 Arrange set of numbers from smallest to
  largest.
• 7, 5, 3, 6, 8, 5, 9
• 3, 5, 5, 6, 7, 8, 9
• Step 2 Find the number that occurs most often.
• 5

Mode
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Range

• Range the difference between the lowest and
  highest number in a set.
• Example
• 2, 5, 6, 8, 9, 12
• Range 10

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How to Calculate the Range

• Step 1 Arrange set of numbers from smallest to
  largest.
• 7, 5, 3, 6, 8, 5, 9
• 3, 5, 5, 6, 7, 8, 9
• Step 2 Find the difference between the highest
  and lowest numbers.
• 9 3 6

Range
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Review Questions
Find the Mean, Median Mode for each student.
What is the average score of Test 3? What is the
average score of Test 6?
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Check Your Answers
What is the average score of Test 3? 81 What is
the average score of Test 6? 79