This was closed Somewhere Else (https://math.stackexchange.com/questions/4314855/without-trial-and-error-averageaveragea-b-c-vs-averagea-averageb-c), and should be closed here for the same reason. You got good feedback on that post, ignored it, and submitted exactly the same question here without trying to improve it. math.CD is not a dumping ground for your rejected, low-effort questions.

"CD is not a dumping ground for your rejected, low-effort questions." This is unmannerly. And you're assuming without evidence I'm that inquirer on Stack Exchange, that can unjustifiably close excellent questions.

I don't think you understand. This question isn't closed because it's a repost from SE. This question is closed because it's a bad question. It would be a bad question regardless of whether it was original or a repost. However, the fact that it's a repost of a closed question means that not only have you posted a bad question, but you have done so knowing full well that it's a bad question—you can't claim ignorance or that you tried your best. That is unmannerly. I consider that a hostile act, in fact. I am interested in being welcoming to newcomers who don't know the ropes, in the hope that they will learn and eventually be positive contributors. I am not interested in welcoming people who willfully refuse to improve; our community is better off without such.

All the above is true even in the absurdly unlikely case (perhaps you don't realize just how idiosyncratic your writing style is) that you've reposted someone else's closed question verbatim. You still know it's a question that doesn't meet SE's standards, and so you've decided to try it out here instead. The implication is that you think our standards are or might be lower. That implication is an insult to this community.