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c.If we use a class interval of 25 feet and beginwith a lower limit of 300 feet, eight classeswould be necessary. A class interval of 30 feetbeginning with 300 feet is also reasonable. Thisalternative requires only seven classes.2–4a.23b.28.75%, found by (23/80)100c.7.5%, found by (6/80)1002–5a.201510502Imports ($ millions)Number ofSuppliers6132010158111417