PS4 overtracked...

[Aura7541]

Ryng_Tolu said:

Wonktonodi said:
for instance sony's internal tracking was 20,280,000 and they felt there internal tracking could be +- 70,000 that would be a range of 20,210,000 to 20,350,000.
So they are confident that it is over 20,200,000 but it could be even more than what are listed here.

...? Sorry but i don't understand... any source?

There's a term in statistics called the confidence interval. It is a range where the actual number has a certain probability of being in that interval. Usually, statiticians and scientists use the 95% confidence interval. So there is a 95% chance that the actual number falls within the interval. So when Sony says PS4 sales are over 20.2 million, it means that the lower bound of the confidence interval is above 20.2 million sales.