The following frequency histogram represents the IQ scores of a random sample of seventh-grade students. IQs are measured to the nearest whole number. The frequency of each class is labeled above each rectangle. Use the histogram to answers parts (a) through (g). 1Os of 7th Grade Students 60 70 80 90 100 110 120 130 140 150 160 1Q scores (a) How many students were sampled? students (b) Determine the class width. The class width is

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