Excel Formula to Calculate Weighted Average Not Returning Expected Results with Decimal Values
This might be a silly question, but I'm currently trying to calculate a weighted average in Excel, but I keep getting unexpected results, especially when dealing with decimal values. For instance, I have weights in column A (ranging from 0.1 to 1.0) and corresponding values in column B. When I use the formula: ```excel =SUMPRODUCT(A1:A10, B1:B10) / SUM(A1:A10) ``` I expect the weighted average to be accurate. However, when my weights total to 1.0, I noticed discrepancies where the result doesn't match manual calculations. Specifically, if I input weights like this: | A | B | |-------|-------| | 0.2 | 10.5 | | 0.3 | 20.0 | | 0.5 | 30.5 | I expect the weighted average to be (0.2 * 10.5 + 0.3 * 20.0 + 0.5 * 30.5) / (0.2 + 0.3 + 0.5) = 22.0. Instead, it's returning 24.1. I've checked to ensure that all values are formatted correctly as numbers and that there are no hidden characters. I'm running Excel 365 (version 2309). Could there be an scenario with how Iām using the `SUMPRODUCT` function, or is there something I might be overlooking with decimal arithmetic in Excel? Any insights or suggestions would be greatly appreciated. I'm working on a application that needs to handle this. I'd really appreciate any guidance on this.