A student is analyzing results from a standard plate count. The exercise was supposed to be performed using two separate samplings for each dilution, but the student was short on time and only did one plate for each dilution. On a plate where a 0.1 mL sample was applied from a 10-6 dilution tube, the student counts 75 colonies. The student calculates the Original Cell Density and puts his answer in proper scientific notation as directed by his instructor. What response below correctly corresponds to the Original Cell Density reported by the student?
