28. You plated 0.1 mL of a sample diluted by a factor of 10…
28. You plated 0.1 mL of a sample diluted by a factor of 10-5 and after incubation you counted 50 colonies. The concentration of bacteria in the original culture is: NOTE: 10-5 is 10 to the negative 5 and 10+5 is 10 to the power of positive 5.