The average in primary school mathematics generally refers to the arithmetic average, that is, the quotient obtained by dividing the sum of a set of data by the number of this set of data. For example, if the sum of the class scores is divided by the class size, the result is the average score of the class. The key to solve the problem of average application is to determine the "total amount" and the total number of copies corresponding to the total amount.

It should be noted that there is a difference between "average" and "average score".

For example, four children ate 28 cookies. How many biscuits did each of them eat on average? 28 ÷ 4 = 7 (block). There is "7 yuan per person" here, but not everyone really eats 7 yuan. There may be eight or six dollars. This is an "average" problem.

Change it to "Divide 28 cookies among 4 children equally. How many cookies are each?" It's still 28 ÷ 4 = 7 (blocks), but it must be 7 blocks for each person when it is divided. This is an "average score" problem.