The average, also known as the mean, is a way to find a central value of a set of numbers.

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Here's how to find it:

- Add all the numbers together.
- Divide the sum by the total number of values in the set.

For example, if you have the numbers 2, 3, 5, and 7, you would:

- Add them together: 2 + 3 + 5 + 7 = 17
- Divide the sum by the number of numbers (4): 17 / 4 = 4.25

So, the average of 2, 3, 5, and 7 is 4.25.

This method works for any set of numbers, whether they are whole numbers, decimals, or even negative numbers.

Here are some additional things to keep in mind:

- There are other types of averages besides the mean, such as the median (the middle number) and the mode (the most frequent number).
- If you're working with a large set of numbers, you can use a calculator or spreadsheet software to find the average.