allerySignificant figures in measurement 30.50:
A5
B3
C4 (trailing zero after decimal IS significant)
D2
Answer & Solution
Correct answer: C. 4 (trailing zero after decimal IS significant)
30.50: all 4 digits significant.
Trailing zero after decimal point shows precision.
**So 30.50 means ±0.005 (i.e., between 30.495 and 30.505).**
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