The poll shows that after
a specified number of rounds, the incumbent Mayor, Ed Lee, has majority support.
If you
specify that subnational units — like States in the USA, or the four nations (and, formerly, the counties)
of the UK — must each have an integer
number of representatives, you face a non-trivial
rounding - off problem, called the «apportionment» problem.
(The rest
of the statistics are in imperial units since they are U.S. - based and so is this site; but the original metric system was created with base units that could be derived from the weight
of a
specified volume
of pure water... hence the nice
round numbers.)