SOLUTION: A test shows that 10 out of 100 gadgets are defective. In a random sample of two gadgets are chosen, the probability that both are defective is:
A 1/1000
B 1/110
C 1/11
D 1/
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-> SOLUTION: A test shows that 10 out of 100 gadgets are defective. In a random sample of two gadgets are chosen, the probability that both are defective is:
A 1/1000
B 1/110
C 1/11
D 1/
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Question 254627: A test shows that 10 out of 100 gadgets are defective. In a random sample of two gadgets are chosen, the probability that both are defective is:
A 1/1000
B 1/110
C 1/11
D 1/10
Help! Found 2 solutions by drk, richwmiller:Answer by drk(1908) (Show Source):
You can put this solution on YOUR website! The probability that the first is defective is 10/100 or 1/10.
The probability the second is defective is 9/99 [we took one gadget out and have 99 left]
P(2 are defective) = 1/10 x1/11 = 1/110. The answer is [ B ]
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