The mean formula is an important concept in statistics that is used to calculate the average value of a set of data. The mean formula can be expressed as Average = Sum/Quantity.

Where sum refers to the sum obtained by adding all the values in a set of data, and quantity refers to the number of that set of data.

Average formula  (number 1 + number 2 + … + number n) ÷ n

For example, if we have a set of data: 3, 5, 7, 9, then the sum of the data set is 3+5+7+9=24, and the quantity is 4, so the average of the data set is 24/4=6.

By using the mean formula, we can quickly calculate the average value of a group of data and understand the central tendency and distribution of the data. In practice, the mean formula is widely used in statistics, data analysis, economic analysis and other fields.