Earlier quoted context omitted.
Correct. If 250 M people use it in the US out of a population of 349 M, Google would make 401 B USD out of them, vs 403 B USD in worldwide revenues. These numbers do not look right to me.
If you’re going to extrapolate you should use the median, which would put it at 200B for USA.
median is the sample in the middle of the distribution (when it is treated as a sequence of samples ordered by their value), e.g. if you have sort(seq(dist))=[100$, 5$, 5$, 3$, 1$] the median is 5$
average is sum(dist)/size(dist), so avg * size(dist) => sum(dist)
in the example above that would be median 5, avg. 22.8, total 114, size 5
if you where to multiple the median by size you would have 25$ for the total value, which is very much very wrong