1. Median Median is the middle number in a data set when the data are arranged in numerical order. If you have an even number of data items, add the two middle numbers together and divide by 2

2. How to find the median 1.Arrange the data set into numerical order from least to greatest. 2. Put a check under each number as you rewrite the numbers in order. 3. We need to find the number in the middle. Count the values and then circle the middle number.

3. Median Example Example: 4,8,2,7,1 Arrange in numerical order: 1,2,4,7,8 The middle number is 4, so the median is 4. Example with an even number of data items: 10,4,8,2,7,1 Arrange in order: 1,2,4,7,8,10 Add the two middle numbers and divide by 2 4+7= 11, 11/2= 5.5, so the median is 5.5

4. Mode Mode –is the number that appears most often in a data set. How to find the mode: 1.Arrange the data set into numerical order from least to greatest. 2. The number that appears most often in the mode. Example: 6,2,4,1,2,8= 1,2,2,6,4,8. the mode =2

5. Mean = the Average Mean- the sum of the numbers in a data set divided by the number of entries in the set Example: 6,2,4,1,5,8 Add all the numbers: 6+2+4+1+5+6=24 Divide by 6, so 24/6=4 the mean is 4

6. Range Range – is the difference between the greatest number and the least number is a set of data. Example: 4,7,1,9,6, Put the numbers in order from least to greatest. 1,4,6,7,9 then subtract the least number from the greatest. 9-1= 8 so the range is 8