Nick Gardner wrote:

I thought that you always round up if 5 or greater, i.e., 15.15 will always
become 15.2, and so on.

I have not heard of any other way of doing this (until now).

The standard meteorological method is to "throw it to the odd". Therefore,
15.15 becomes 15.1 whereas 15.25 becomes 15.3. I believe the logic in this is
to eliminate systematic bias that would be caused if rounding was always up (or
down).

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.