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In the textbook, I noticed numbers are sometimes written with a decimal at the end and no following digits, such as 350. pm. Is this to indicate that we should be using 3 sig figs instead of two (in this case)? Does that decimal make 350 3 sig figs instead of 2?
Yes. Sig Figs count all numbers proceeding and preceding the decimal point, unless the only number before the decimal point is a 0, and 0's preceding a non-zero after a decimal point a not counted, only numbers following and including the non zero are counted. Ex: 0.00305 there are 3 sig figs, being 3, 0, and 5.
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