2. The following table shows a summary of the final grades for a class in Mathematical Methods III, taught by DEXTER CHANG at University of Manitoba in Spring 2005.

Class Limits	Frequency	Relative	Percent
of Final Grades		Frequency	Frequency
30 to <40 40 to <50 50 to <60 60 to <70 70 to <80 80 to <90	1 1 2 14 19 9
90 to 100	9

a. Complete the chart for Relative Frequency and Percent Frequency.

b.. Create a percent frequency histogram of the data.

c. Based on the histogram, what is the mode of this data? Briefly explain.