For example, in some sports events, the concept of weight should also be used. For example, in diving competition, each athlete has to complete a certain number of optional movements in addition to the prescribed movements;

But the difficulty of choosing the action is different. Because of the different difficulty coefficients of the selected movements, the scores of the two players are also different, although the quality of their respective movements is the same. The higher the difficulty coefficient, the higher the athlete's score should be, and the difficulty coefficient actually plays the role of weight.

Extended information such as: 80 points for quizzes and 90 points for final exams. If the teacher wants to calculate the total average score, it should be calculated according to the proportion that the quiz score accounts for 40% and the final score accounts for 60%. Then your average score is:

80×40%+90×60%=86

There are χ people who eat three bowls, Y people who eat two bowls and Z people who eat one bowl in the school canteen. How much does everyone eat on average?

(3××χ+2×y+ 1×z)÷(χ+y+z)

Here, x, y and z are the weight values respectively, and "weighting" refers to considering the proportional share of different variables in the population.

Baidu encyclopedia-weighted score