The Consumer Confidence Index published at the end of each of the past 20 months showed the following consumer confidence levels:
87, 89, 88, 91, 88, 90, 86, 87, 91, 90, 86, 91, 90, 87, 88, 88, 89, 89, 90, 89
a. Show the data in a relative frequency table.
b. Show the data in a relative frequency bar chart.