The weighted average is the average of different specific gravity data. Weighted average is to calculate the original data in a reasonable proportion. If x 1 appears f 1 times, x2 appears f2 times, …, and xk appears fk times among n numbers, it is called the weighted average of x 1, x2, …, xk. F 1, f2, …, fk are the weights of x 1, x2, …, xk.
Formula:, where. F 1, f2, …, fk are called weights.
Average is a special case of weighted average, that is, when the weights of each item are equal, weighted average is arithmetic average.
Extended data:
Add a horizontal line between words or numbers:
This kind of line is called delete line, which is a symbol used for computer marking clarity. There are two kinds of strokes, which can be single strikethrough or double strikethrough.
Usually, when modifying a document for others, in order to compare it with the original text, strikethrough is used to remind readers that this is what needs to be deleted.
Double strikethrough is for the clarity of computer marking. Because if you simply delete the lines, it is likely that the strokes will be very light, which is not obvious or even invisible on the computer. Other modifiers are best not to be used. Since you say double strikethrough, you may be mistaken for other symbols. Another reason is that the marking teacher may not know the symbols you modified.
References:
Baidu Encyclopedia _ Average