Variables to display image based on score on Test Results page

I have Lectora Inspire v 11.1. After user takes the test, I want to show a graphic based on the # of responses correct, whether they pass or fail. Are there variables and actions I can program that allows me to show an image based on a test score? For example - If user gets 2 out 15 right, I want to show the image that corresponds with 2 out of 15. If user gets 5 out of 15, I want to show the image that corresponds with 5 out of 15, etc. I checked the 'Use Customized Test Results' box in the Test Behaviors but cannot figure out how to modify variables when various test scores are reached. Any ideas? Am I asking for the impossible? Thanks