Find the error intervals for the following truncated numbers

Question 1:

2.642 (3 d.p.)
2.642≤x<2.643

Question 2:

0.00076 (2 s.f.)
0.00076≤x<0.00077

Question 3:

0.50 (2 d.p.)
0.50≤x<0.51

Question 4:

1.44 (2 d.p.)
1.44≤x<1.45