What is 2750 rounded to?
The rules when rounding off numbers are as follows :-
1) If the first figure to be discarded is 5 or more, then the
previous figure is increased by 1.
Example : 5.1935 = 5.194 (4sf) = 5.19 (3sf) = 5.2 (2sf) = 5
(1sf)
2) Zeros must be kept to show the position of the decimal point
or to indicate that zero is a significant figure.
Thus, 2750 is the answer to 4sf and also to 3sf.
2800 is the solution to 2sf and 3000 is the answer to 1 sf.