It is 3.5
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2711 rounded to 2 significant digits is 2700
2 of them are significant.
There are 5 significant digits in number 14500. To count for a given number as to how many significant digits does it have, look for the first zero form left and decimal point. For ex sample 0045 has 2 significant digits 0.0045 has 2 significant digits 0.4500 has 4 significant digits.
There are 2 significant digits: 5 and 4
2 and 5.