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This question belongs to Products . Please move it here, you will be more likely to get some answers.
And yes, this is something easy to do in SFDC on contacts with a rollup summary field. Shoot for an average rather than a sum, though, or if you can, get both. The reason is that you may not have identified all contacts in an account and a simple sum will lead to overlooking accounts for which the contacts are not yet identified.
How are you doing a roll-up summary field here? Accounts and contacts don't have a master-detail relationship. I built out flows and a process to do this. Are you using some kind of app?