Answer:
Step-by-step explanation:
∑ m / 5 = (12.45 + 12.32 + 12.54 + 12.30 + 12.50) / 5 = 12.42
Δm = 12.42 - 12.0 = 0.42
ε·100% = Δm·100% / m = 0.42·100% / 12 ≈ 3.5 %
d) 3.5%
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