Scientists calculated that the mean area of the clear zone for ciprofloxacin was 29% smaller than for the garlic extract when tested on Salmonella. Explain how they calculated this.
a) They subtracted 29% of the garlic extract's mean from the ciprofloxacin mean.
b) They divided the ciprofloxacin mean by 29% of the garlic extract's mean.
c) They found 29% of the garlic extract's mean and added it to the ciprofloxacin mean.
d) They divided 29% by the difference of the two means and multiplied by 100.
