You received a water sample suspected to be contaminated with Coliform bacteria. You make three serial dilutions (dilution 1, dilution 2, and dilution 3) of the sample by pipetting 1 ml into 49 ml of medium during each dilution step before plating a 0.1 ml sample from each dilution onto the surface of a nutrient agar (NA) plate. After 48 hours incubation time, you count 89 bacterial colonies on the plate with the dilution 3 sample. What was the "CFU" (in cfu/ml) of bacteria in the water sample?
(Show your calculation work below to receive full credit!).
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