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02/07/2021 12:11 pm
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12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.
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02/07/2021 12:12 pm
Numbers of pens = Numbers of defective pens + Numbers of good pens
∴ Total number of pens = 132 + 12 = 144 pens
P(E) = (Number of favourable outcomes/ Total number of outcomes)
P(picking a good pen) = 132/144
= 11/12 = 0.916