A municipality tested 400 residential drinking water wells: 320 showed no detectable nitrates, 60 showed low concentrations below regulatory thresholds, and 20 exceeded safe limits. What proportion of tested wells complied with regulatory drinking standards?
Answer and explanation
Correct answer: C. 95%
- Step 1: Compliant wells include those with no nitrates (320) plus those below the threshold (60): wells. Step 2. Calculate the compliance proportion: . Answer: 95%. Why not the others: considers only wells with zero nitrates (); and are computational miscounts.
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