Probability Practice Question and Answer
8 Q: Five dice are tossed together. What is the probability of getting different faces in all of the dice?
253 064f56be94687b15f94b44b4b
64f56be94687b15f94b44b4b- 1false
6!/66
- 2true
6!/65
- 3false
5!/65
- 4false
5!/66
- 5false
6!/55
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Answer : 2. " 6!/65
"
Q: A school has 45% girls. If 80% of girls score more than 75% marks and 70% of the boys have score more than 75% marks. If a student is selected at random and is found to have more than 75% marks, find the probability of it being a boy.
223 064dc7c18d02c5c746bf45d36
64dc7c18d02c5c746bf45d36- 177/149true
- 275/149false
- 3Cannot be determinedfalse
- 411/20false
- 59/20false
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Answer : 1. "77/149"
Q: A person can hit a target 5 times out of 8 shots. If he fires 10 shots, what is the probability that he will the target twice?
539 064b4f3e1e154aff5337290bd
64b4f3e1e154aff5337290bd- 1$${1135×3^8}\over 8^{10} $$false
- 2$${1165×3^8}\over 8^{10} $$false
- 3$${1175×3^8}\over 8^{10} $$false
- 4$${1125×3^8}\over 8^{10} $$true
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Answer : 4. " $${1125×3^8}\over 8^{10} $$"
Q: A speaks the truth 5 out of 7 times and B speaks truth 8 out of 9 times. What is the probability that they contradict each other in stating the same fact?
424 064abe46765d2524cbf2197ca
64abe46765d2524cbf2197ca- 1$${1\over 7}$$false
- 2$${1\over 9}$$false
- 3$${1\over 4}$$false
- 4$${1\over 3}$$true
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Answer : 4. "$${1\over 3}$$"
Q: The probabilities of solving a problem by three students A, B and C are $$3\over 7$$, $$5\over 9$$ and $$1\over 5$$ respectively. The probability that problem will be solved is:
270 0649e770dab3c5fffc2ee1c4c
649e770dab3c5fffc2ee1c4c- 1$$155\over 315$$false
- 2$$64\over 315$$false
- 3$$251\over 315$$true
- 4$$32\over 315$$false
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Answer : 3. "$$251\over 315$$"
Q: A glass jar contains 6 white, 8 black, 4 red and 3 blue marbles. If a single marble is chosen at random from the jar, what is the probability that it is black or blue?
522 06492d7aa14cf8fe013dc1538
6492d7aa14cf8fe013dc1538- 1$${8\over 21}$$false
- 2$${11\over 21}$$true
- 3$${5\over 21}$$false
- 4$${1\over 7}$$false
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Answer : 2. "$${11\over 21}$$"
Q: In a lottery, there are 7 prizes and 21 blanks. If a lottery is drawn at random, then what is the probability of getting a prize?
413 0631f3174671e1904db721676
631f3174671e1904db721676- 1$${2\over5}$$false
- 2$${3\over5}$$false
- 3$${1\over4}$$true
- 4$${1\over10}$$false
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Answer : 3. "$${1\over4}$$"
Q: In a single throw of a dice, what is the probability of getting a number greater than 3?
432 0631f3113b0a2a82fc566662a
631f3113b0a2a82fc566662a- 1$${1\over4}$$false
- 2$${2\over3}$$false
- 3$${3\over2}$$false
- 4$${1\over2}$$true
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