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Reading two-way relative frequency tables

Researchers once surveyed college students on their Facebook use. The following two-way table displays data for the sample of students who responded to the survey.
Approximately what percent of students in the sample do not use Facebook?
Round your answer to the nearest percent.
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
%
AgeUses FacebookDoes not use FacebookTOTAL
1818 to 22227878448282
23+23\,\text{+}70706767137137
TOTAL1481487171219219