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    Table V
    Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center
    15.922.59.116.8
    6.428.615.223.7
    10.317.013.820.5
    7.425.04.118.4
    12.713.630.921.3

Use the following classes: 0-5, 5-10, 10-15, 15-20, 20-25, 25-30, 30-35. What is the relative frequency of the class 10-15?

Please select the single best answer