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IB Chemistry

I have to calculate uncertainties and the total uncertainty and i am sure how to do this.

so my errors are balance (0.01g)
graduated cylinder (0.75 ml)
voltmeter (0.01V)

for the balance i know that i have to do this:
mass of zinc: (3.00/0.01) * 100
mass of copper (2.00/0.01)* 100

and for the total i add that

i am not sure about the graduated cylinder:
i measure a solution 5 times for 5 trials. 1 time for each trial
should i do (50 ml/ 0.75*5) * 100
or (50ml/0.75)*100
or just add 0.75 to the total uncertainty and thats it?

Same thing for the voltmeter error, where i do five trials?

thank you in advance