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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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Detailed Solution

Given: Numbers of defective pens = 12 and Numbers of good pens = 132

Total number of pens = 132 + 12 = 144

We know that, P(E) = (Number of favorable outcomes/ Total number of outcomes)

P(getting a good pen) = 132/144

= 11/12 = 0.916

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