10 - Maths - Unit 12. Probability
20 Questions
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Prepared by Mr. A. GANESAN, VICE PRINCIPAL, SHRI GURU BRAMMA VIDHYALAYA, KARUR-5 & www. Padasalai. Net
Questions and Answers
- 1.If Ø is an impossible event, then P(Ø) =
- A.
0
- B.
1
- C.
1/4
- D.
1/2
- 2.If S is the sample space of a random experiment, then P(S) =
- A.
1
- B.
0
- C.
1/8
- D.
1/2
- 3.If p is probability of an event A, then p satisfies =
- A.
0 ≤ p ≤ 1
- B.
0 < p < 1
- C.
0 ≤ p < 1
- D.
0 < p ≤ 1
- 4.Let A and B be any two events and S be the corresponding sample space. Then P(Ā ∩B)=
- A.
P(B)- P(A∩B)
- B.
P (A ∩B)- P(B)
- C.
P(S)
- D.
P[ (AUB)']
- 5.The Probability that a student will score centum in mathematics is 4/5. The Probability that he will not score centum is =
- A.
1/5
- B.
2/5
- C.
3/5
- D.
4/5
- 6.If A and B are two events such that P(A) = 0.25, P(B) = 0.05 and P(A∩B)=0.14, then P(AUB) =
- A.
0.16
- B.
0.61
- C.
0.14
- D.
0.6
- 7.There are 6 defective items in a sample of 20 items. One item is drawn at random. The Probability that it is a non-defective item is
- A.
7/10
- B.
0
- C.
3/10
- D.
2/3
- 8.If A and B are mutually exclusive events and S is the Sample space such that P(A) =1/3P(B) and S= AUB, then P(A)=
- A.
1/4
- B.
1/2
- C.
3/4
- D.
3/8
- 9.The Probabilities of three mutually exclusive events A, B and C are given by 1/3,1/4 and 5/12. Then P(AUBUC) is
- A.
1
- B.
19/12
- C.
11/12
- D.
7/12
- 10.If P(A)= 0.25 , P(B)= 0.50 , P(AB) = 0.14 then P(neither A or B ) =
- A.
0.39
- B.
0.25
- C.
0.11
- D.
0.24
- 11.A bag contains 5 black balls , 4 white balls and 3 red balls. If a ball is selected at random , the probability that it is not red is =
- A.
3/4
- B.
5/12
- C.
4/12
- D.
3/12
- 12.Two dice are thrown simultaneously. The probability of getting a doublet is =
- A.
1/6
- B.
1/36
- C.
1/3
- D.
2/3
- 13.A fair die is thrown once . The probability of getting a prime or composite number is
- A.
5/6
- B.
1
- C.
0
- D.
1/6
- 14.Probability of getting 3 heads or 3 tails in tossing a coin 3 times is
- A.
1/4
- B.
1/8
- C.
3/8
- D.
1/2
- 15.A card is drawn from a pack of 52 cards at random. The probability of getting neither an ace nor a king card is
- A.
11/13
- B.
2/13
- C.
4/13
- D.
8/13
- 16.The probability that a leap year will have 53 fridays or 53 saturdays is
- A.
3/7
- B.
2/7
- C.
1/7
- D.
4/7
- 17.The Probability that a non-leap year will have 53 Sundays and 53 Mondays is
- A.
0
- B.
1/7
- C.
2/7
- D.
3/7
- 18.The Probability of selecting a queen of hearts when a cards is drawn from a pack of 52 playing cards is
- A.
1/52
- B.
16/52
- C.
1/13
- D.
1/26
- 19.The Probability of sure event is
- A.
1
- B.
0
- C.
100
- D.
0.1
- 20.
- A.
2/3
- B.
1/3
- C.
1
- D.
0
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