Mean, Median, Mode ReviewENGR 1181Class 7

Mean

Definition: arithmetic average of a set of values

Equation: x =

Mean Example10 9 8 5 10

4 3 3 7 2

8 1 6 5 8

= 5.6

MedianDefinition: value that occurs in the middle of a set of data that has been arranged in numerical order

Note:

A data set that contains an odd # of values always has a median

For a data set that contains an even # of values, the average of the 2 middle values is the median

Median Example

10 10 9 8 8 8 7 6 5 5 4 3 3 2 1

10 9 8 5 10

4 3 3 7 2

8 1 6 5 8

Arranged in decreasing order:

Median = 6

Mode Definition: the number within a data set that

occurs with the highest frequency

Mode Example10 9 8 5 10

4 3 3 7 2

8 1 6 5 8

Mode = 8