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4 Defective Pens Are Accidentally Mixed with 16 Good Ones. It is Not Possible to Just Look at a Pen and Tell Whether Or Not It is Defective. One Pen is Drawn at Random from the Lot. What is the Probability that the Pen is Defective? - ICSE Class 10 - Mathematics

ConceptProbability - A Theoretical Approach

Question

4 defective pens are accidentally mixed with 16 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is drawn at random from the lot. What is the probability that the pen is defective?

Solution

Total number of pens = 4+16=20

Total possible outcomes=20

Number of defective pens=4

p(defective pen)=4/20=1/5

Is there an error in this question or solution?
Solution 4 Defective Pens Are Accidentally Mixed with 16 Good Ones. It is Not Possible to Just Look at a Pen and Tell Whether Or Not It is Defective. One Pen is Drawn at Random from the Lot. What is the Probability that the Pen is Defective? Concept: Probability - A Theoretical Approach.
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