RAILWAY EXAM
SUBJECT: PROBABILITY
1. A carton consists of 100 shirts, of which 74 are good, 20 have minor defects and 6 have major defects. Arun, a trader will accept the shirts which are good but saran, another trader, will reject the shirts which have major defects. One shirt is drawn at random from the carton. What is the probability that it is acceptable to saran?
(A) 0.98 (B) 0.20 (C) 0.94 (D) None
Answer: C
Explanation: Required probability = (74+20)/100 =0.94
2. Mohan throw two unbiased dice together and get a sum of 5. If his friend Varun, now throw the same two dice, then what is the probability that the sum is lesser than 5?
(A) 7/25 (B) 8/25 (C) 9/25 (D) 10/25
Answer: A
Explanation: Total number of outcomes = 5^2 =25
Outcome for sum less than 5 = (1,1) (1,2) (1,3) (1,4) (2,1) (2,2) (3,1) = 7
Probability = 7/25
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