Question

10 defective pens are accidentally mixed with 90 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.
a is 0.10
b is 0.20
c is 0.90
d is 1.0

Answer 1

Step-by-step explanation:

the correct answer is c

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Answer 2

Option c. 0.90

Step-by-step explanation:

Number of defective pens = 10

Number of good pens = 90

Total number of pens = 90 + 10

                                    = 100

one pen is taken out at random from this lot. The probability that the pen taken out is  good one.

$Probability=\frac{\text{favorable outcome}}{\text{total outcome}}$

                 $=\frac{90}{100}$

                 = 0.90

The probability that the pen is taken out is a good one is 0.90

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