Question

12 defective pens are mixed with 120 good ones. One pen is taken out at random from this lot. Calculate the probability that the pen taken out is not defective.

Answer 1

Answer:

Step-by-step explanation:

No. of good pens = 120

No. of defective pens = 12

Total No. of pens = 120 + 12 = 132

$Probability = \frac{No. of favourable outcomes}{Total No. of outcomes}$

No. of out comes favourable to not a defective pens = 132 - 12 = 120

∴ p(e) =  $\frac{120}{132}$

         = 0.90

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Answer 2

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