There are two contexts in my experience where it's been important to get the numbers exactly right:
1. Cherrypicking sports statistics for newly set records and the like (NB: this is not lucrative)
2. Financial transaction processing
In most other contexts, especially analytics and reporting, nobody cares and nobody is going to check your math, because the consumers are just trying to put a veneer of numeracy on their instincts.
1. Cherrypicking sports statistics for newly set records and the like (NB: this is not lucrative)
2. Financial transaction processing
In most other contexts, especially analytics and reporting, nobody cares and nobody is going to check your math, because the consumers are just trying to put a veneer of numeracy on their instincts.