the announced attendance at a football game was 52,806.

is this an exact number?

Yes, if someone counted. If it was estimated, it is not exact.

no, that would merely mean that that 52,806 people had come through the turnstiles, other people such as first aiders, food vendors etc would be present at the game who did not use the turnstiles ..

To determine if 52,806 is an exact number, we need to understand what an "exact number" means. In mathematics, an exact number is a value that can be represented precisely, without any approximation or rounding.

In the case of the announced attendance at a football game, it is highly unlikely that the number is an exact value. Typically, attendance figures for events like football games are estimated rather than measured precisely. These estimates are often based on ticket sales and other factors, but they may not account for variables such as no-shows or last-minute ticket purchases.

If you want to confirm whether 52,806 is an exact number or an estimate, you would need to consult the source of the announcement. The organization responsible for reporting the attendance, such as the stadium management or the sports team, may provide more information on how the number was determined.

In summary, without further details, it is reasonable to assume that 52,806 is an estimated attendance rather than an exact number. To determine the level of accuracy, you would need to refer to the source of the announcement for additional information.