BI-1472
Antibiotics
Biology · Secondary 4 · Medium · Antibiotics
A student tests four different antibiotics on bacteria using filter paper discs on agar. The diameters of the clear zones around one antibiotic are 10 mm, 14 mm and 12 mm in three Petri dishes. What is the mean diameter of the clear zone for this antibiotic?
- 10 mm
- 11 mm
- 12 mm
- 36 mm
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