Can you average weighted averages?
Weighted average is the average of a set of numbers, each with different associated “weights” or values. To find a weighted average, multiply each number by its weight, then add the results….Example:
| Calculating Weighted Average | ||
|---|---|---|
| Test Score | Assigned Weight | Test Score Weighted Value |
| 50 | .15 | 7.5 |
| 76 | .20 | 15.2 |
| 80 | .20 | 16 |
How do you combine weighted averages?
A combined mean is simply a weighted mean, where the weights are the size of each group. For more than two groups: Add the means of each group—each weighted by the number of individuals or data points, Divide the sum from Step 1 by the sum total of all individuals (or data points).
How do you weight data?
This process is called sample balancing, or sometimes “raking” the data. The formula to calculate the weights is W = T / A, where “T” represents the “Target” proportion, “A” represents the “Actual” sample proportions and “W” is the “Weight” value.
How do you average 2 averages?
To find the average percentage of the two percentages in this example, you need to first divide the sum of the two percentage numbers by the sum of the two sample sizes. So, 95 divided by 350 equals 0.27. You then multiply this decimal by 100 to get the average percentage.
How do I add two averages in Excel?
Click a cell below the column or to the right of the row of the numbers for which you want to find the average. On the HOME tab, click the arrow next to AutoSum > Average, and then press Enter.
What is the use of weighted average?
The weighted average takes into account the relative importance or frequency of some factors in a data set. A weighted average is sometimes more accurate than a simple average. Stock investors use a weighted average to track the cost basis of shares bought at varying times.
How do you calculate the weighted average mass?
Use the atomic masses of each of the isotopes along with their percent abundances to calculate the average atomic mass. Change each percent abundance into decimal form by dividing by 100. Multiply this value by the atomic mass of that isotope. Add together for each isotope to get the average atomic mass.