QUESTION $4$

Wastewater is sampled from a collection system. Analysis is performed to determine a variety of wastewater characteristics. The Biochemical Oxygen Demand $($BOD$)$ test results are presented in Table $1.$ The average $BO{D}_5$ in $m\frac{g}{L}$ is most nearly:

a$)$

$100$

b$)$

$150$

c$)200$

d$)250$

Table $1-$ Biochemical Oxygen Demand $($BOD$)$ test results for example problem.

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