The following (see picture) relative frequency ogive represents the graduation rate of all four-year universities in the United States. Source: payscale.com. (a) What is the class width? (b) Approximately 10% of all four-year universities have a graduation rate below what level? (c) What percent of all four-year universities have a graduation rate less than 60%? (d) Five percent of all four-year universities have a graduation rate above what level?

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