it was estimated that 12,000 people attended the football game friday night. what could have been their actual number of people at the game

It is not given till which place estimation has to be done.

Estimated Number of People who attended the football game friday night=12,000

⇒ If Estimation is done using ones

Then, Actual number of people at the game will be

11,995 ≤ Spectator ≤ 12,004

⇒If Estimation is done using Tens

Then, Actual number of people at the game will be

11,950 ≤ Spectator ≤ 12,049

⇒If Estimation is done using Hundreds

Then, Actual number of people at the game will be

11,500 ≤ Spectator ≤ 12,499

11999 i gues becuz i killed the other 1