Try this: 1. Select "Change Style" 2. Select the "Choose an attribute to show" drop-down menu, scroll to the bottom of the list, and select "New Expression" 3. Enter the following under "Expression" on line 1: Sum($feature["Associate_s_degree"], $feature["Bachelor_s_degree"]) 4. Select "OK" 5. Select "Counts and Amounts (Color)" as your drawing style. That should get you the heat map you are looking for.
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