Maribor Cement Company of Montevideo, Uruguay, hired Delbert Olsen, an American manufacturing consultant, to help design and install various production reporting systems for its concrete roof tile factory. For example, today Maribor made 7,000 tiles and had a breakage rate during production of 2 percent. To measure daily tile output and breakage rate, Olsen has set up equally spaced classes for each. The class marks (midpoints of the class intervals) for daily tile output are 4,900, 5,500, 6,100, 6,700, 7,300, and 7,900. The class marks for breakage rates are 0.70, 2.10, 3.50, 4.90, 6.30, and 7.70.

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