Indicate which of the following are exact numbers: (a) the
mass of a 3- by 5-in. index card, (b) the number of ounces
in a pound, (c) the volume of a cup of Seattle's Best coffee,
(d) the number of inches in a mile, (e) the number of microseconds
in a week, (f) the number of pages in this book.
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Master Significant Figures with a bite sized video explanation from Jules Bruno