A Residency Program Organized a Barbecue at the Beginning of the Academic

A residency program organized a barbecue at the beginning of the academic year to welcome the new class of first-year residents.  The total number of attendees was 100, including faculty, administrative staff, and residents.  Hamburgers, hotdogs, and potato salad were served.  The following day, 28 of the attendees had diarrhea and vomiting.  All of the attendees were questioned about what they had eaten, and the following table was obtained: Which of the following best describes the attack rate among all of the attendees who had potato salad?

A) 8%
B) 11%
C) 13%
D) 20%
E) 28%
F) 30%
G) 34%
H) 47%

Correct Answer:

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