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# What is the probability that there is exactly 1 defective pen in a box

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Re: What is the probability that there is exactly 1 defective pen in a box [#permalink]
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What is the probability that there is exactly 1 defective pen in a box of pens?

(1) The probability that all the pens in the box are not defective is 96 percent.
(2) The probability that there is more than 1 defective pen in the box is 3 percent.
1) p(~ def)=0.96
p(def)=0.04
not sufficient
2)p(> 1 def)=0.03
not sufficient
1+2)
p(exactly 1 def)=p(def)-p(>1 def)
sufficient
Ans C
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Re: What is the probability that there is exactly 1 defective pen in a box [#permalink]
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Re: What is the probability that there is exactly 1 defective pen in a box [#permalink]
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