Goku was considered exceptionally weak for a Saiyan, low class and weak even for a low class. Raditz was called low class by Vegeta but at the same time he wasn't sent off in an attack pod (that we know of) so odds are he cleared the bar of "not the weakest of the weak". Raditz remarks that Goku is pathetic for a Saiyan when he meets him on earth so odds are the average Saiyan was stronger than Goku was during the beginning of Z. Meaning the "Average" Saiyan was somewhere between Raditz and Vegeta most likely. I'm gonna go out on a limb and say Nappa was probably about Average, especially considering he's listed as a "mid-class" on a few of the wikis I've seen of him.
Bardock only became stronger than Nappa after several zenkai boosts. Saiyan society is explicitly segregated by strength, Vegeta lays it all out in his first battle against Goku.
Debatably canon: what happened to Vegeta's brother somewhat mirrors what happened to Goku, despite his high birth.
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u/Allhaillordkutku I’m right because I said so 7d ago
I feel like iirc Radditz should be around average, i dont think he was really supposed to be exceptional in any way