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.
Weighted Average Method Overview. The weighted average method is used to assign the average cost of production to a product. Weighted average costing is commonly used in situations where: 1  Inventory items are so intermingled that it is impossible to assign a specific cost to an individual unit. 2  The accounting system is not sufficiently sophisticated to track FIFO or LIFO inventory layers.