If a measured value is $2.745$ and needs to be rounded off to 3 significant figures, what will be th

Question

If a measured value is $2.745$ and needs to be rounded off to 3 significant figures, what will be the rounded value according to the standard rules?

Professor PC Thomas Classes · Answer

The preceding digit ($4$) is even, and the digit to be dropped is exactly $5$. According to the rounding off rules, if the preceding digit is even, it is left unchanged. Hence, it rounds to $2.74$.