Consider the following data set:   56, \ 56, \ 64, \ 45, \ 69, \ 42, \ 42, \ 18, \ 42, \ 65 59, \ 71, \ 64, \ 18, \ 42, \ 72, \ 62, \ 20, \ 69, \ 60 72, \ 71, \ 51, \ 62, \ 42, \ 62, \ 66, \ 72, \ 60, \ 18   The class width of a histogram with 6 classes is

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