10/10000

Website: Modified from: https://www.researchgate.net/publication/322213380_Effect_of_the_adhesion_of_Ag_coatings_on_the_effectiveness_and_durability_of_antibacterial_properties/figures?lo=1 

Dr. Spencer: Alright, let's talk about the results from your serial dilutions and which plates you should focus on for counting colonies. Any thoughts?

You: Well, I noticed that some plates have a dense lawn of growth, while others only have a few colonies here and there. I'm not entirely sure which ones we should count. The 1/10⁴ dilution seems straightforward enough to count. 

You: The key is to find plates with a manageable number of colonies. Typically, we aim for plates with 30 to 300 colonies. This range provides a good balance between statistical accuracy and ease of counting. The colonies have to be well-separated to allow reliable counting, at the same time, if the sample is too dilute the results will not be reliable.

Sam: I see, in this case the 1/10⁴ dilution seems to have fewer colonies than the required ones for statistical accuracy. 

Dr. Spencer: Correct. Let’s give it another try!