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Flossing Frequency for Adults with Gum Disease

Avg difficulty 2.5

Sixty adults with gum disease were asked the number of times per week they used to floss before their diagnosis. The (incomplete) results are shown in the table.

# flossing per week Frequency Relative frequency Cumulative relative frequency
0 27 0.4500
1 18
3 0.9333
6 3 0.0500
7 1 0.0167
  1. Fill in the blanks in the table.
  2. What percent of adults flossed six times per week?
  3. What percent flossed at most three times per week?

OpenStax Introductory Business Statistics 2e, 1.3 Levels of Measurement, exercise 12

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Adapted from Introductory Business Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Business Statistics 2e. Imported at revision 50ec917.