Uncertainty is taken as the half of the least that we can measure withe concerned scale by which we measured the said quantity. When we measure something s 9.2 we must have measured it using mm scale. So uncertainty = 0.5 mm or 0.05 cm. The measurement 9.2 +/- 0.05 has two significant figures out of which one that is '9' is reliable and '2' is unreliable by +/-0.05.
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