Texts: a. What was the cell density in the original sample? b. What combination(s) of volumes and dilution factors could have been used to inoculate this plate? 19 The original cell density in a sample is 2.79 x 10^6 CFU/mL. Which sample volume should yield a countable plate? (Express your answer as 10 mL.) 20 The original cell density in a sample is 5.1 x 10^4 CFU/mL. Which sample volume should yield a countable plate? (Express your answer as 10 mL.) a. What sample volume should yield a countable plate? b. Which two dilution tubes could be used to produce this sample volume? How? A sample has a density of 7.9 x 10^3 CFU/mL. a. What sample volume should yield a countable plate? b. Which two dilution tubes could be used to produce this sample volume? How?

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