The report 2013 International Bedroom Poll: Summary of Findings describes a survey of 251 adult Americans conducted by the National Sleep Foundation (sleepfoundation.org/sites/default /files/RPT495a.pdf, retrieved April 15, 2017). Participants in the survey were asked how often they change the sheets on their bed and were asked to respond with one of the following categories: more than once a week, once a week, every other week, every three weeks, or less often than every three weeks. For this group, 10% responded more than once a week, 53% responded once a week, 26% responded every other week, 5% responded every three weeks, and 6% responded less often than every three weeks. 

a. Use the given information to make a relative frequency distribution for the responses to the question.

b. Summarize the given information by constructing a bar chart.