What Characteristic of Some Waters Make Them 'Hard

question 4

Multiple Choice

What characteristic of some waters make them 'hard'?

• A) high acidity
• B) freezes easily
• C) high mineral content
• D) high micelle concentration
• E) None of the above.

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Definitions:

Percentile

A value on a scale of 100 that indicates the percent of a distribution that is equal to or below it.

Quartiles

Divisions of a data set that mark three points to divide the data into four equal parts, each representing a quarter of the dataset.

Histogram

A graphical representation of data using bars of different heights to show the frequency of data in different intervals.

Interquartile Range

The difference between the 75th and 25th percentiles of a data set, representing the spread of the middle 50% of values.