From this answer, the unconditional means and standard deviations are
Mean = 1505, standard deviation = 339
Mean = 1675, standard deviation = 346
What about the case for ratings of 2000+ ?
preferably for as of...Apr2021, same month as the above computations, if it's hard to repeat the above for as of Sep2021 and then
as of Sep2021 if it's not so hard to repeat above Apr2021 computations for Sep2021?
(Basically E[X|X=>2000] and square root of Var[X|X=>2000])
And actually while we're at it may we please also see these?