**How To Do A Weighted Average**. Variance has to do with how precise your data is. Weights cannot be negative, though they can be zero.

The weights do not have any. The weighted average is helpful to make a decision when there are many factors to consider and evaluate. Weighted average cost is a common inventory valuation method used by ecommerce businesses.

### The higher the WAM, the longer How Does Weighted Average Maturity Work?

Originally Answered: How do you calculate your grade's weighted total as a percentage?

Once you have your numbers, you'll need to know how much each of them weighs, or is worth, as part of your final. Do you use Weighted Mean / Weighted Average? For cells adjacent to each other I use sumproduct but can't find info on how to do it if the cells I need a weighted avg for.