$15$ defective ballpens are accidentally mixed with 135 good ones. It is not possible to just look at a ballpen and say whether it Is defective or not. One ballpen is picked up at random from it. Find the probability that the ballpen selected is a good one.

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Solution

Good pens+Defective pens $=$ $135 + 15 = 150$
$n (s) = 150$
$P (A) = \frac{n (A)}{n (S)} = \frac{135}{150} = \frac{9}{10}$ Answer.

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15 defective ballpens are accidentally mixed with 135 good ones. It is not possible to just look at a ballpen and say whether it Is defective or not. One ballpen is picked up at random from it. Find the probability that the ballpen selected is a good one.

Good pens+Defective pens = 135+15=150n(s)=150P(A)=n(A)n(S)=135150=910 Answer.

$15$ defective ballpens are accidentally mixed with 135 good ones. It is not possible to just look at a ballpen and say whether it Is defective or not. One ballpen is picked up at random from it. Find the probability that the ballpen selected is a good one.

Good pens+Defective pens $=$ $135 + 15 = 150$
$n (s) = 150$
$P (A) = \frac{n (A)}{n (S)} = \frac{135}{150} = \frac{9}{10}$ Answer.