Uncertainties and practical work - Edexcel
Note that this is to 2 sf since the measurements are to 2 sf. The percentage uncertainty in the area of the square tile is calculated by multiplying the percentage uncertainty in the length by 2. Percentage uncertainty in A = 2 × 0.6% = 1.2% Therefore the uncertainty in A = 7100 × 1.2% = 85 mm2 So A = 7100 mm2 ± 1.2% or A = 7100 mm2 ± 85 mm2 b.
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