Table V
Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center

15.9	22.5	9.1	16.8
6.4	28.6	15.2	23.7
10.3	17.0	13.8	20.5
7.4	25.0	4.1	18.4
12.7	13.6	30.9	21.3

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

Please select the single best answer

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