Question
27 defective printers were kept with 81 non-defective printers. One printer is picked at random. Find the probability that the printer is defective.
Solution
Number of defective printers = 27
Total number of printers = 81 + 27 = 108
Required probability = (27/108) = (1/4)
More Probability Questions
- A card is drawn randomly from a collection of total face cards. What is the probability that the drawn card is a Queen?
- A bowl contains 9 blue balls, 7 white, and 5 black balls. If 2 balls are drawn in one go, then the probability of exactly one ball being blue is:
- A letter is taken out at random from ‘ROORKEE’ and another is taken out from ‘BOOKKEEPER’. The probability that they are the same letter is
- A die is biased in such a way that if thrown once, then the probability of getting an odd number on the die is (1/5) more than the probability of getting a...
- A box contains 6 red balls, 5 green balls, and 4 blue balls. Two balls are drawn at random. What is the probability that one ball is red and the other is b...
- Three persons i.e. ‘D’, ‘E’ and ‘F’, are given the same puzzle to solve. The probability that ‘D’, ‘E’ and ‘F’ will solve the puzzle is (5/8), (2/3) and (3...
- A box contains 4 red, 5 blue and 3 green balls. Two balls are drawn at random without replacement. What is the probability that both balls are of the same ...
- An instructor has a question bank consisting of 200 easy True / False questions, 300 difficult True / False questions, 400 easy multiple-choice questions a...
- A fair coin is tossed 3 times. ‘A’ wins if exactly one tail appears. Otherwise, ‘B’ wins. What is the probability that ‘A’ wins?
- Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that al...
Relevant for Exams:
