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Mean and Median Math

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MEAN The mean is a synonym for average.

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MEAN To find the mean (average) of a group of numbers the first step is to add all of the numbers. Example: 4, 10, 3, 7, 2, 10 = 36

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MEAN After you have added all of the numbers, the next step is to divide the sum by the total number of addends. Example: 36/6 = 6 Mean = 6

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MEAN Note: sometimes, you do not get a whole number.

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MEAN Now, you try one! 7, 9, 11, 6, 13, 6, 6, 3, 11 What is the first step?

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MEAN = 72 What is the next step?

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MEAN Divide 72/9 = 8 Mean = 8 Now, let’s try 1 more!

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**Find the mean for this group of numbers.**

11, 10, 24, 16, 14

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MEAN = 75

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MEAN 75/5 = 15 Mean = 15

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MEDIAN The median is the middle number or value. To find the median the first step is to put the numbers in order from least to greatest.

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MEDIAN The number in the middle of the list is the median.

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MEDIAN 4, 23, 16, 17, 6, 10, 20 Put the numbers in order from least to greatest.

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MEDIAN 4, 6, 10, 16, 17, 20, 23 Median = 16

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MEDIAN Now you try one! What is the median of 5, 11, 23, 9, 10

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MEDIAN 5, 9, 10, 11, 23 Median = 10

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MEDIAN 6, 3, 7, 6, 11, 13, 6, 11, 9 Put the numbers in order from least to greatest.

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MEDIAN 3, 6, 6, 6, 7, 9, 11, 11, 13 Median = 7

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MEDIAN If there are two middle values, the median is halfway between them.

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MEDIAN 13, 7, 6, 8, 6, 3, 11, 6, 11, 9 Put the numbers in order

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MEDIAN 3, 6, 6, 6, 7, 8, 9, 11, 11, 13 There are two middle numbers or values, 7 and 8. The median is halfway between 7 and 8. The median is 7 ½ or 7.5.

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