Measures of Central Tendency

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Measures of Central Tendency

• MEAN
• MEDIAN
• MODE
• RANGE

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QUIZ
MEAN

• Mean is the average.
• To find the average, add up all of the numbers
  and divide by the number of addends.
• For Example
• Jennys Test Scores 98 79 88 78 84
• 98 79 88 78 84 427
• Divided by 5 85.4

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MEDIAN
Firstorder the numbers from least to greatest
Secondthe number that falls in the middle is
the median. Jennys Test Scores 98 79 88
78 84 Order from least to greatest 78 79 84
88 98 Median 84
Sometimes there is an even amount of
numbers Example 98 79 88 78 84 90 Order from
least to greatest 78 79 84 88 90
98 84 and 88 are in the middle, so average them
84 88 172 172
divided by 2 86
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MODE
The number that appears the most. 8, 9, 7,
4, 8 8 is the mode Sometimes there can be
more than one mode. 12, 14, 14, 13, 15,
12 12 and 14 are the modes Sometimes there
is no mode. 13, 15, 17, 19, 21 No Mode
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RANGE
The difference between the greatest number and
the smallest number. What is the range of
Tommys test scores? 77, 90, 100, 78, 85,
100, 82 Largest number 100 Smallest number
77 100 - 77 23 This is the range!
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Range Quiz

• 1. Find the range for the following numbers
• 77, 98, 75, 77, 98, 50,
  99
• a. 77 and 98 b. 24 c. 49 d. 77
• Jenny got a 98, 56, 88 and an 88 on her math
  quizzes. What was the grade range?
• a. 88 b. 42 c. 72 d. 82.5

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Mean Quiz

• Joey got a 75, 68, 70, and 87 on his Social
  Studies tests. What was his average?
• 75 b. 69 c. No mean d. 19
• Karen golfed a 100, 120, 110, 110, and 100. What
  was her average golf score?
• a. 20 b. 110 and 100 c. 110 D. 114

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Median Quiz

• Find the median for the following
• 35, 17, 35, 45, 15, 14
• No median b. 35 c. 27 d. 26
• 130, 110, 140, 125, 100
• a. 125 b. 121 c. No median d. 140

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Nice Try!
Dont forgetyou must order the numbers from
least to greatest!
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Mode Quiz

• Find the mode for the following
• 17, 25, 4, 6, 5, 24, 16
• 24 b. No mode c. 16 d. 14
• 2. 24, 30, 24, 36, 35, 20
• 27 b. 30 c. 28 d. 24
• 17, 25, 14, 30, 17, 14
• a. 17 b. 17 and 14 c. 14 d. No
  mode

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