The Office of Coal, Nuclear, Electric and Alternate Fuels reported the following data as the costs (in cents) of the average revenue per kilowatt-hour for sectors in Arkansas:

a. Prepare a grouped frequency distribution for the average revenue per kilowatt-hour using class boundaries 4, 5, 6, 7, 8, 9.
b. Find the class width.
c. List the class midpoints.
d. Construct a relative frequency histogram of these data.

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6.61 7.61 6.99 748 5.10 7.56 6.65 5.93 7.92 5.52 7 47 6.79 8.27 7.50 744 6.36 5.20 5.48 7.69 8.74 575 6.94 7.70 6.67 4.59 5.96 7.26 5.38 8.88 7.49 6.89 7.25 .9 6.41 5.86 8.04