Means, percentages and uncertainty
Handling repeats
Repeat measurements, leave out anomalies (values far from the rest), then take a mean.
Half the range gives a rough uncertainty.
percentage change = (final − start) ÷ start × 100
- potato 2.50 g before, 2.30 g after
- (2.30 − 2.50) ÷ 2.50 × 100 = −8.0%
Percentage change lets you compare pieces that started with different masses. A loss is negative.
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