Question: The class marks of a frequency distribution having 5 classes are 4, 13, 22, 31, and 40. If all of the class widths are equal

The class marks of a frequency distribution having 5 classes are 4, 13, 22, 31, and 40. If all of the class widths are equal and all of the class limits are whole numbers, find all of the class intervals of this distribution

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