Q. 84.1( 7 Votes )

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 is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

Answer :

Given,

Total defective pens = 12


Total good pens = 132


number of favourable cases = 132


Total number of pens = 12 + 132


Total number of pens = 144


Number of total outcomes will 144.


Probability that the pen taken out is a good one =


P(pen taken out is good one) =


P(pen taken out is good one) =


Probability of pen taken out is good one is


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