The phrase "to assign a rating" means to give or determine a score or grade to something, such as a product, service, or performance, in order to evaluate its quality, worth, or performance level. Full definition
Interestingly, when asked to provide a numerical rating of lesson effectiveness, most participants assigned a rating of 3 or 4. (citejournal.org)
Life insurance companies typically begin by assigning a rating based on your health. (bestliferates.org)
For many policy types, insurers will assign a rating class which groups people by health status, family history, and other factors. (truebluelifeinsurance.com)