The Post Office Has Established a Record in a Major

question 41

Multiple Choice

The Post Office has established a record in a major midwestern city for delivering 90 percent of its local mail the next working day. If you mail eight local letters, what is the average number you expect to be delivered the next day?

• A) 3.6
• B) 4.0
• C) 7.2
• D) 2.7

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Definitions:

Food Chain

The order in which one population feeds on another in an ecosystem, thereby showing the flow of energy from a detritivore (detrital food chain) or a producer (grazing food chain) to the final consumer.

Algae

A diverse group of photosynthetic organisms, ranging from unicellular microalgae to large multicellular forms, that are typically found in aquatic environments.

Insect Larvae

are the juvenile form of insects following hatching from eggs, before metamorphosing into their adult forms.

Detritus Food Chain

A series of processes by which nutrients are recycled in an ecosystem, starting from organic waste and decomposing organisms to detritivores and then to their predators.