As part of its study, Gallup investigated a possible relationship between tipping attitudes and income. Using the poll results, the following row percentages can be obtained for three income ranges-less than $30,000; $30,000 through $74,999; and $75,000 or more.

a. Construct a percentage bar chart of recommended tip percentage for each of the three income ranges.
b. Using the bar charts, describe the relationship between recommended tip percentage and income level.

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Appropriate Tip Percent Less than 15% | 15% | 16-19% | 20% or more ! Total Income Less than $30,000 $30,000 through $74,999 | 100% 100% 100% 28.41% 28.41% 42.04% | 1.14% 6.12% 9.18% 35.71 % 50.00% 15.31% 8.16% 42.86% 32.66% | | S75,000 or more Among those surveyed having an opinion.