31. A die is tossed twice. Getting a number greater than 4 is considered a success. Then the variance of the probability distribution of the number of successes is :
(a) 2/9
(b) 4/9
(c) 1/27
(d) none of these
| Subject Name : Engineering Mathematics |
| Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT |
| Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant |
| Engineering Mathematics Books
|
| GATE 2023 Total Info | ENGG DIPLOMA | UGC NET Total Info |
| IES 2023 Total Info | PSUs 2022 Total Info | CSIR UGC NET Total Info |
| JAM 2023 Total Info | M TECH 2023 Total Info | RAILWAY 2022 Total Info |
Related Posts
Probability » Exercise - 13. A die is tossed thrice. Find the probability of getting an odd number at least once ? (a) 7/5 (b) 6/5 (c) 7/8 (d) 2/8- Probability » Exercise - 137. In order to get atleast once a head with probability ≥0.9, the number of times a coin needs to be tossed, is : (a) 3 (b) 4 (c) 5 (d) none of these
- Probability » Exercise - 113. If A & B are any two events, then the probability that exactly one of them occur is : (a) P (A) + P (B) - P (A ∩B) (b) P (A) + P (B) - 2 P (A ∩B) (c) P (A) + P (B) - P (A ∪B) (d) P (A) + P (B) - 2 P (A ∪B)
- Probability » Exercise - 14. The probability of obtaining an even prime number on each die, when a pair of dice is rolled is : (a) 0 (b) 1/3 (c) 1/12 (d) 1/36
- Probability » Exercise - 15. 6 coins are tossed simultaneously . The probability of getting atleast 6 heads is : (a) 57/64 (b) 229/256 (c) 7/64 (d) 37/256