In Developing Countries,most Sewage Is

question 53

Multiple Choice

In developing countries,most sewage is

• A) Discharged, untreated, into surface waters.
• B) Handled via communal septic tanks.
• C) Subjected to primary (physical) but not chemical treatment.
• D) Subjected to both primary and secondary sewage treatment.

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Definitions:

Tchebysheff's Theorem

A statistical theorem that provides a bound on the probability that the value of a random variable deviates from its mean by more than a certain multiple of its standard deviation.

Standard Deviations

Measures the amount of variation or dispersion from the mean in a set of data points.

Empirical Rule

A statistical rule stating that for a normal distribution, nearly all data will fall within three standard deviations (denoted as sigma) of the mean.

Numerical Descriptive Measures

Statistics that quantitatively describe or summarize features of a collection of information, such as mean, median, mode, and range.