Discussion
Of the given numbers,
(1) 25300
(2) 5.600
(3) 0.07200
the number of significant figures for
Answer: E
The correct statement is (2) and (3) are four.
In 5.600 all digits count: the 5, the 6 and the two trailing zeros after the decimal point, which are significant. In 0.07200 the leading zeros only fix the decimal point and do not count, leaving 7, 2, 0, 0: four significant figures.
For 25300 the trailing zeros of a whole number without a decimal point are not taken as significant, so it has three, not five. (2) is not two and (3) is not three, and (1) does not have four.
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