Count how many isolate you have(1.e 114) and multiply that number by 0.9 for MIC90 or 0.5 for MIC50. So to find out the MIC90 of 114 isolate, you would multiply 114x0.9=10.26..rounded is 103. That mean when you sort all 114 MICs from smallest to largest, the 103 isolate is your MIC90.
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