I need to compare the UFC/ml I found in my positive control vs the treatment, by a division. So for example I got
Positive control:
-3 dilution: 1,25*10^7 UFC/ml
Treatment:
-2 dilution: 1,33*10^6 UFC/ml
I need to find the survival fraction from the treatment by dividing them with the positive control
Survival fraction= N/N0, with N being CFU/ml on treatment and N0 CFU/ml of my control.
Can I do that division among different dilutions?