Natural Science Federal guidelines require drinking water to have less than .050 milligram per liter of lead. A test using 21 samples of water in a midwestern city found that the average amount of lead in the samples was .040 milligram per liter. All samples had lead content within 5% of the average.
(a) Select a variable and write down what it represents.
(b) Write a three-part inequality to express the results obtained from the sample.
(c) Did all the samples meet the federal requirement?
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