The standard deviation is a measure that indicates the extent to which the peaks and troughs of a wave differ on average from the mean voltage. A large standard deviation is a measure of large amplitude waves, i.e., on average the peaks and troughs differ by a large extent from the mean voltage.
The weighted average formula is used to calculate the average value of a particular set of numbers with different levels of relevance. The relevance of each number is called its weight. The weights should be represented as a percentage of the total relevancy. Therefore, all weights should be equal to 100%, or 1.
Stockbyte/Stockbyte/Getty Images. The weighted average is the mean of a set of numbers in which some numbers are worth more, or carry more weight, than others. Knowing how to calculate weighted average is beneficial when calculating grades, since different assignments, exams and quizzes often carry different weights.1  How to Do a Weighted Score. 2  How to Calculate Weighted Average.he weighted average is the mean of a set of numbers in which some numbers are worth more, or carry more weight, than others. Knowing how to calculate weighted average is beneficial when calculating grades, since different assignments, exams and quizzes often carry different weights.