A graphic is a way to summarize information intended to add value to the reader or the audience who will see it.
For determining what audience the visual would appeal to, it is needed to think:
1. What is the graphic about? Is the information relevant to my public?
2. Which level of education my audience has? Can I show the information in terms of numbers or without?
3. What is the intention of my audience of watching that graphic? Is a job thing? A school or an university activity? Is something that my audience do in his free time therefore is keen and open to know more about an specific topic?
Having all of these questions answered you will be able to reach the best audience for your visual.