A flow weighted average is found by dividing the total load over the estimation time by the total stream flow.

Time Weighted Average is an average using time as the weight. For example assume 3 gallons flows for 5 minutes then 10 gals for 5 mins then 7gals for 15 mins. The time-weighted average of flow over the total time is [(3x5)+(10x5)+(7x15)] all divided by (5+5+15) and equals 5 gallons per minute.

What is weighted average atomic number

The Dow Jones Industrial average is a price weighted index.

You can't convert an unweighted average into a weighted average simply by adding something. You have to do the whole calculation for the weighted average.