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Key Terms Measures of central tendency (averages): Mean Median Mode
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Mean Most common type of average Calculated by adding all of the values up and then dividing the total by the number of values M is typically the symbol for mean, n is typically the symbol for sample size
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Mean To calculate the mean, you add 2150 to 1534 to 3564 and divide the sum by 3 (n = 3) The mean is 2416
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Weighted Mean When you have multiple occurrences of the same value in a data set Calculated as (value x frequency)/total frequency
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Weighted Mean To calculate the weighted mean, divide (total value x frequency) by (total frequency) The weighted mean is 89.67
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Median The median is simple the middle value when all values are arranged from highest to lowest In the data set, half (50%) of the values should fall above the median and half should fall below When there are an even number of values, the median is the mean of the two middlemost values
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Median For odd-numbered data sets, select the middle value For even number data sets take the mean of the two middle values The median for the first data set is $42537. The median for the second data set is $42447.
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Mean VS. Median Q: Why use the median as a measure of central tendency? A: Median is not sensitive to extreme scores (outliers)
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Mean VS. Median The mean for this data set is $50056. The median is $42537.
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Mode Mode is, very simply, the most frequently occur piece of data in the set In this data set, the mode is Brown hair
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