Question 86395: A computer store has 10 copies of a word processing program. 12 copies of a spread sheet program, and 8 copies of a drawing program. Three of the word processing, four of the spread sheet, and two of the drawing program are infected with a virus. If a program is selected at randow, the probability it is infected with a virus is?
A. 11/30
B. 7/30
C. 3/10
4. 1/4
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A computer store has 10 copies of a word processing program. 12 copies of a spread sheet program, and 8 copies of a drawing program. Three of the word processing, four of the spread sheet, and two of the drawing program are infected with a virus. If a program is selected at randow, the probability it is infected with a virus is?
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There are 9 infected progs of the 30, so
P(draw an infected) = 9/30 = 3/10
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Cheers,
Stan H.
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