Every semester break, the Faculty of Business and Economics coordinates a luncheon with local business leaders for graduating seniors, their families, and friends. Corporate sponsorship pays for the tunches of each of the seniors, but students have to purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon and f is the number of graduating seniors in each category. Referring to the histogram below, how many graduating seniors attended the luncheon? 251 (9 O 275

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