A friend of yours has bought a lovely 150 year old farmhouse in rural Maryland.

Question

A friend of yours has bought a lovely 150 year old farmhouse in rural Maryland. The water in the house comes from a recently dug well. She is concerned with the purity of the water, especially given the very high content of iron in the area. Iron is not considered toxic, but it can be unpleasant in drinking water and cause other problems (stains, clogging, orders, etc.) in a home's water system. The recommended limit for iron in a home is 0.3 milligrams per liter (mg/L). She has purchased a testing kit which she uses to test a sample every Friday morning at 11:30. The sample returns a single current value of iron (e.g. 0.37) in the household water system. She then takes the resulting value and places it on a graph in Excel with dates (Fridays over the year) on the x-axis and mg/L on the y-axis. Which of the following is true for our scenario?

Explanation / Answer

Here 0.37 mg/L is metric which is concerning with unit of measurement. The graph contains measure and testing on Friday morning is called measurement. Therefore, option D is correct.

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