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uncertaintys

Tango calculations:

Making aliquot:
Tango added = 25cm ±0.04cm
Distilled water added = 225 ±0.05cm

Uncertainty added together ±0.09cm

Value of titres = Final – initial
8.00 – 0.00= 8.00cm

Uncertainty in result: 8.00cm ± 0.05cm
0.00cm ± 0.05cm

Add uncertainty= 0.10cm

Value of average titres=
(8.00+8.00)/2 = 8.00cm
Uncertainty in result: remains the same 0.10cm


what is the over all uncertainty in this ? ?
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