TABLE 4-8 According to the Record of the Registrar's Office at a at a State

question 54

Short Answer

TABLE 4-8
According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore, 16% are junior and the rest are senior. Among the freshmen, sophomores, juniors and seniors, the portion of students who live in the dormitory are, respectively, 80%, 60%, 30% and 20%.
-Referring to Table 4-8, what is the probability that a randomly selected student is a junior or senior who lives in a dormitory?

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Definitions:

Composite Volcano

A type of volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.

Felsic Lava

Lava that is high in silica content, resulting in high viscosity and explosive eruptions; it is characteristic of volcanoes at continental margins.

Tephra

Rock fragments and particles ejected by a volcanic eruption which include ash, lapilli, and volcanic bombs.

Composite Volcanoes

Volcanoes characterized by explosive eruptions and composed of alternating layers of lava and volcanic ash.