Why do we round up 0.5000 to 1 instead of rounding down to 0?

Question

Why do we round up 0.5000 to 1 instead of rounding down to 0?

In: 12

Answer 1

There has to be a convention, even if it’s arbitrary. We have chosen upwards.

However it does make some sense. All the other decimals 0.5xxx are greater than half so go upwards. For consistency therefore, 0.5000 ought to also.