Average
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Average is the sum of a group of numbers divided by the number of values in the group. For example, the average of 3, 5, and 7 is 
.
Another term for average is the arithmetic mean.
The other two common types of average are the median and the mode.
- The median is the value which splits the group of numbers in the middle: half are higher, half are lower.
- The mode is the most common number.
