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Old 08-05-2007   #1
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Default Statistics "sample probability" HELP?!?

In a sample of 154 cartridges from a certain lot, 38 were found to be contaminated and 116 were "clean". If you randomly select 4 of these 154 cartridges, what is the probability that all 4 will be clean? The probability that all four cartridges will be "clean" is: ______ (round to four decimal places).
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Old 08-05-2007   #2
Erin G
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prob of clean = 116/154 = .75325Prob that all four are clean = .753425 ^ 4 = .3219
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