For the (bonus) question on comparing impact of an “average” charity with the best one, it would probably be worth specifying whether we mean mean or median, as I know some people here expect (I think myself included) a very significant difference between mean and median.
It could also be useful to specify a few other things about the question, such as whether charities saving future lives are legitimate to include in the calculation and whether the language about helping the world’s poorest people was specifically intending to restrict the set to global poverty charities.
For the (bonus) question on comparing impact of an “average” charity with the best one, it would probably be worth specifying whether we mean mean or median, as I know some people here expect (I think myself included) a very significant difference between mean and median.
It could also be useful to specify a few other things about the question, such as whether charities saving future lives are legitimate to include in the calculation and whether the language about helping the world’s poorest people was specifically intending to restrict the set to global poverty charities.