5 defective glasses are accidentally mixed with 20 good ones. The good glasses and the defective ones look the same from outside. If a glass is chosen at random, what is the probability that the chosen glass is good?
The correct option is A 0.8 Given, the total number of glasses = (20+5) = 25 ⇒ Total number of outcomes = 25
Let E be the event of choosing a good glass.
Number of good glasses = 20 ⇒ Number of favourable outcomes = 20
Probability P(E)=Number of favourable outcomesTotal number of outcomes=2025=45=0.8
Therefore, the probability of getting a good glass is 0.8.