To generate bell curve based on the below scenario

Summary:

We are using workforce performance-performance rating real time as subject area. We wanted the calibrated score to be pulled in the form of bell curve. We noticed that the calibrated score was storing the value under 'workforce performance-performance rating real time' --> performance rating-->performance rating-->average manager section rating. Because average manager section rating is a fact column, hence we were not able to get the desired bell curve. Is there any way we can store the calibrated score into a different column or can you suggest us any alternative to get the bell curve.

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