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Question

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?
  1. 0.8

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Solution

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.

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