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Asampleof800personsscreenedforacertaindiseaseisdistributed accordingtoageand disease status resulting from a clinical exam as follows: DiseaseStatus Totals None Moderate Severe Age Old 122 139 61 322 Middle age 74

  1. Asampleof800personsscreenedforacertaindiseaseisdistributed accordingtoageand disease status resulting from a clinical exam as follows:

DiseaseStatus

Totals

None

Moderate

Severe

Age

Old

122

139

61

322

Middle

age

74

90

35

199

Young

104

121

54

279

Totals

300

350

150

800

a. Whatistheprobabilitythatthepatientwithseverediseasestateisselected?

b. Ifapatientwithmoderatediseasestatusisselected,findtheprobabilitythatthepatient is not old.

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