Astate health department reports a 55% rate of a certain virus for the "at-risk" population. under certain conditions, a preliminary screening test for the virus is correct 90% of the time. (subjects are not told that they are infected until additional tests verify the results.) if someone is randomly selected from the at-risk population, what is the probability that they have the virus if it is known that they have tested positive in the initial screening?

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.