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What is the absolute uncertainty in the measurement of the temperature increase?

Do sigfig rules for addition and subtraction apply also to uncertainties?

For the example above, would the uncertainty be +/- 1 degrees celsius (retaining one sigfig only -- not using sigfig rules in uncertainty) or would it be +/- 1.0 degrees celsius (retaining 2 sigfig / 1 decimal place -- using sigfig/decimal place rules in uncertainty).

Thank you.