I have seen this question and have tried the code suggested: Adapting ESRI ArcGIS API for JavaScript Feature Layer With Selection sample for use in Configurable Map Viewer (CMV)
But I have been unable to get it to work. I also want to change the result from the sum to the average.
Here is my error report from chrome development tools 
Answer
For your first issue: it appears that the template file for your widget is missing, inaccessible or corrupt. Based on the code posted in the linked example, the template file is './Select/templates/Select.html'. Check that file to ensure it is valid.
For your second issue: to do a simple average, you would take the sum calculated in the example code this.productionSum and divide by the number of features event.features.length. Something like:
this.productionAVG = (this.productionSum / event.features.length)
Be sure to handle a possible divide by zero error in the cases where no features are returned by the selection.
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