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You calculated a value of 0.54 s ± 0.06 s for the time constant from your...

You calculated a value of 0.54 s ± 0.06 s for the time constant from your graph.  If you used a 1MΩ resistor with a tolerance of 10%, what is the equivalent capacitance of your circuit (including the uncertainty)?

I got C = 5.4e-7 but I don't know how to calculate uncertainty.  

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