"Weighted" means "multiplied by the weight", which means "multiplied by the coefficient".

The weight refers to the different weights taken in the adjustment calculation due to the difference in accuracy of the measured values.

The higher the accuracy, the greater the weight.

Example: When the school calculates final grades, midterm exams account for 30%, final exams account for 50%, and assignments account for 20%. If someone scores 84 in the midterm exam, 92 in the final, and 91 in assignments, if it is the arithmetic average, then it is (84+92

+91)/3=89.

Extended information: Weighted average: In some sports competitions, the idea of ??weighting is also used. For example, in diving competitions, in addition to completing the prescribed actions, each athlete must also complete a certain number of optional actions, and the difficulty of the optional actions is

Differently, due to the different difficulty coefficients of the actions selected by the two players, although the quality of completing their respective actions is the same, their scores are also different. The athlete with a higher difficulty coefficient should score higher, and the difficulty coefficient actually plays the role of weight.

When evaluating a student's grades for a semester, we usually don't just look at his final grade, but take into account the results of his usual tests, mid-term exams, etc. For example, a student's grades in two unit tests are 88, respectively.

90, the midterm exam score is 92, and the final exam score is 85. If you simply calculate the average of these four scores, and treat the usual tests equally with the midterm and final exam scores, you will ignore the importance of the final exam.

Given this consideration, we tend to assign different weights to these four grades.