Question
5 defective glasses are accidentally mixed with 20 good ones. The good glasses and the defective ones look the same from the outside. If a glass is chosen at random, what is the probability that the chosen glass is good?
Answer: Option B
:
B
Given, total number of glasses =25(20+5)
⇒ Total number of outcomes =25
Let E be the event of getting good glass.
Number ofgood ones =20
⇒ Number of favourable outcomes =20
Probability P(E)=Number of outcomes favourable to ENumber of all possible outcomes of the experiment
=2025=45
∴ The probability of getting a good glass is 45.
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:
B
Given, total number of glasses =25(20+5)
⇒ Total number of outcomes =25
Let E be the event of getting good glass.
Number ofgood ones =20
⇒ Number of favourable outcomes =20
Probability P(E)=Number of outcomes favourable to ENumber of all possible outcomes of the experiment
=2025=45
∴ The probability of getting a good glass is 45.
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