5 significant figures.
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1 fluid ounce = 29.57353 mL (to 7 significant digits)
A 100 mL graduated cylinder is graded in divisions of 1 mL giving results which have 2 significant figures. Cylinders for measuring up to 10 mL to have divisions at 0.1 mL, so again giving 2 sig figs.2 digits. .
As many as are required
2 of them.
There are 5 significant figures in this measurement.