* Test Version: Different versions of the SRI exist, each with its own scoring system and norms.
* Student Population: The average score will vary dramatically depending on the school, district, and even the specific classroom. A wealthy suburban school will have a different average than a school in a low-income urban area.
* Year of Testing: Norms and scoring can change over time.
To find a relevant average, you'd need to specify the SRI version used and the specific population being considered (e.g., the average SRI score for 12th graders in a particular school district). The data would typically be held by the school or district administering the test.