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Tendency

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central tendency

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Tendency

1. 1. Mean Median Mode Range Measures of Central Tendency Any of three measures (mean, median, mode) that represents a type of average of a set of data
2. 2. Mean The mean is the mathematical average of a set of numbers. The mean is commonly referred to as the “average”. The mean is easy to calculate. Measures of Central Tendency MEAN = sum of values number of values
3. 3. Calculate the Mean Find the mean of the data set. 1, 5, 3, 7, 3, 3, 6 (Seven Items) 1 + 5 + 3 + 7 + 3 + 3 + 6 = 28 Add all Values 28 ÷ 7 = 4 Divide the sum by the number of items. The mean price of the candy is 4. Measures of Central Tendency MEAN = sum of values number of values
4. 4. Median The median is the middle value of a set of data. Measures of Central Tendency ODD set of values EVEN set of values 1 3 4 6 7 1 3 4 6 7 8 Median is 4 4 + 6 2 Median is 5 10 2 = = 5 Arrange the values in ascending order. There is one middle value, so find the mean of these values. There are two middle values, so find the mean of these values. 1 3 4 6 7 1 4 3 7 6 1 4 3 7 6 8 Arrange the values in ascending order. 1 3 4 6 7 8
5. 5. Calculate the Median Find the median of the data set. 1, 5, 3, 7, 3, 3, 6 1 3 3 3 5 6 7 Arrange the values in order. 1 3 3 3 5 6 7 The median price of the candy is 3. There is one middle value, so find the mean of these values. Measures of Central Tendency
6. 6. Mode Measures of Central Tendency The mode is the number that occur most often in a set of data.
7. 7. Mode Measures of Central Tendency Find the mode of the data set. 1, 5, 3, 7, 3, 3, 6 The number 3 is the mode because it is the score that occurs the highest number of times.
8. 8. Range Measures of Central Tendency The range is the difference between the least and greatest value in the set.
9. 9. Measures of Central Tendency Find the range of the data set. 1, 5, 3, 7, 3, 3, 6 7 is the greatest value and 1 is the least value Range Subtract the least value from the greatest value 7 - 1 The range price of the candy is 6. 6