The hemoglobin A1c test, a blood test given to diabetic patients during their periodic checkups, indicates the level of control of blood sugar during the past 2 to 3 months. The following data values were obtained for 40 different diabetic patients at a university clinic:

a. Classify these A1c values into a grouped frequency distribution using the classes 3.7€“4.7, 4.7€“5.7, and so on.
b. What are the class midpoints for these classes?
c. Construct a frequency histogram of these data.

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6.5 5.0 5.6 7.6 4.8 8.0 7.5 7.9 8.0 9.2 6.4 6.0 5.6 6.0 5.7 9.2 8. 8.0 6.5 6.6 5.0 8.0 6.5 61 64 6.6 7.2 5.9 4.0 5.7 79 6.0 5.6 6.0 6.2 77 6.7 7.7 8.2 9.0