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Welcome to GATE CSE Doubts, where you can ask questions and receive answers from other members of the community.

Recent questions tagged probability

0 votes
1 answer 24 views
A First Course in Probability by Sheldon Ross Chapter 1
In how many ways can 3 boys and 3 girls sit in a row if the boys and the girls are each to sit together?
asked May 15 in Combinatory Parag Tamhankar 5 points 24 views
0 votes
0 answers 62 views
IIT Gandhinagar Written Test Probability Question
There are 100 rooms in a hotel. The hotel manager is lazy. When a customer requests a room, the manager picks a room from 1 to 100 uniformly at random without even bothering to check whether it is already occupied. If the room is already ... try to check in, one by one, to the hotel. Show that the expected number of occupants is at least 50.
There are 100 rooms in a hotel. The hotel manager is lazy. When a customer requests a room, the manager picks a room from 1 to 100 uniformly at random without even bothering to check whether it is already occupied. If the room is already occupied, the customer is asked ... that 100 customers try to check in, one by one, to the hotel. Show that the expected number of occupants is at least 50.
asked May 12 in Probability Subham Das 7 points 62 views
0 votes
0 answers 10 views
Probability Sheldon Ross Self doubt
Consider a random chord of a circle. What is the probability that the length of the chord will be greater than the side of the equilateral triangle inscribed in that circle?
Consider a random chord of a circle. What is the probability that the length of the chord will be greater than the side of the equilateral triangle inscribed in that circle?
asked May 11 in Probability Divyanshu Shukla 1 point 10 views
0 votes
1 answer 13 views
Exam operating system
When switching the CPU between two processes.. which of the following applies A. The PCB is both, saved and reloaded, only for the interrupted process that is existing the CPU B. The PCB is saved for the process that is scheduled for the CPU C. The PCB is reloaded for the process that is scheduled for the CPU D. No PCB is saved or reloaded E. None of the above
When switching the CPU between two processes.. which of the following applies A. The PCB is both, saved and reloaded, only for the interrupted process that is existing the CPU B. The PCB is saved for the process that is scheduled for the CPU C. The PCB is reloaded for the process that is scheduled for the CPU D. No PCB is saved or reloaded E. None of the above
asked May 2 in Operating System Malak 5 points 13 views
0 votes
0 answers 12 views
TIFR-2019 probabilty
consider an urn with ‘a’ red and ‘b’ blue ball . Balls are drawn out one by one without replacement uniformly at random until the first red ball is drawn .what is expected no of ball drawn?
consider an urn with ‘a’ red and ‘b’ blue ball . Balls are drawn out one by one without replacement uniformly at random until the first red ball is drawn .what is expected no of ball drawn?
asked Mar 25 in Probability sridhar15399 5 points 12 views
0 votes
0 answers 14 views
TIFR-GS2021 Question
Lavanya and Ketak each flip a fair coin (i.e., both heads and tails have equal probability of appearing) $n$ times. What is the probability that Lavanya sees more heads than Ketak? In the following, the binomial conefficient $n\choose k$ counts the number of $k$-element subsets of an $n$-element ... $\sum_{i=0}^{n}\frac{{n\choose i}}{2^{2n}}$
Lavanya and Ketak each flip a fair coin (i.e., both heads and tails have equal probability of appearing) $n$ times. What is the probability that Lavanya sees more heads than Ketak? In the following, the binomial conefficient $n\choose k$ counts the number of $k$-element subsets of an $n$ ... $\sum_{i=0}^{n}\frac{{n\choose i}}{2^{2n}}$
asked Mar 24 in Probability zxy123 3.6k points 14 views
0 votes
0 answers 11 views
TIFR-GS2021 Question
A matching in a graph is a set of edges such that no two edges in the set share a common vertex. Let $G$ be a graph on $n$ vertices in which there is a subset $M$ of $m$ ... $p^{2m}$ (D) $(1 - p^2)^m$ (E) $1 - (1 - p(1 - p))^m$
A matching in a graph is a set of edges such that no two edges in the set share a common vertex. Let $G$ be a graph on $n$ vertices in which there is a subset $M$ of $m$ edges which is a matching. Consider a random process where each vertex in the graph is independently selected with probability $0 < p < 1$ and let $B$ ... $1 - (1 - p^2)^m$ (C) $p^{2m}$ (D) $(1 - p^2)^m$ (E) $1 - (1 - p(1 - p))^m$
asked Mar 24 in Probability zxy123 3.6k points 11 views
0 votes
0 answers 11 views
TIFR-GS2021Question
What is the probability that at least two out of four people have their birthdays in the same month, assuming their birthdays are uniformly distributed over the twelve months? (A) $\frac{25}{48}$ (B) $\frac{5}{8}$ (C) $\frac{5}{12}$ (D) $\frac{41}{96}$ (E) $\frac{55}{96}$
What is the probability that at least two out of four people have their birthdays in the same month, assuming their birthdays are uniformly distributed over the twelve months? (A) $\frac{25}{48}$ (B) $\frac{5}{8}$ (C) $\frac{5}{12}$ (D) $\frac{41}{96}$ (E) $\frac{55}{96}$
asked Mar 24 in Probability zxy123 3.6k points 11 views
0 votes
1 answer 33 views
East Africa University Second Semester Probability and statistics 2020
A random variable X which takes two values 0 and 1 with probability q and p respectively. Let P(X=1)=p and P(X=0)=q, q=1-p Show that E(X)=p and Var(X)=pq Find the Mgf of X
asked Mar 7 in Revision vanso 254 5 points 33 views
1 vote
0 answers 35 views
DRDO 2020 computer science descriptive exam
Consider a binomial experiment of flipping a biased coin five times with probability of head ,p=0.75 and probability of tail q=0.25 in each flip. What is the probability that last two flips will be heads if the first three flips are known to be tails ?
Consider a binomial experiment of flipping a biased coin five times with probability of head ,p=0.75 and probability of tail q=0.25 in each flip. What is the probability that last two flips will be heads if the first three flips are known to be tails ?
asked Feb 25 in Probability rapidxy 9 points 35 views
4 votes
1 answer 656 views
GATE CSE 2021 Set 2 | Question: 22 | Video Solution
For a given biased coin, the probability that the outcome of a toss is a head is $0.4$. This coin is tossed $1,000$ times. Let $X$ denote the random variable whose value is the number of times that head appeared in these $1,000$ tosses. The standard deviation of $X$ (rounded to $2$ decimal place) is _________
asked Feb 18 in Probability Arjun 257 points 656 views
3 votes
3 answers 842 views
GATE CSE 2021 Set 2 | Question: 29 | Video Solution
In an examination, a student can choose the order in which two questions ($\textsf{QuesA}$ and $\textsf{QuesB}$) must be attempted. If the first question is answered wrong, the student gets zero marks. If the first question is answered correctly and the second question is not ... and then $\textsf{QuesA}$. Expected marks $22$. First $\textsf{QuesA}$ and then $\textsf{QuesB}$. Expected marks $16$.
asked Feb 18 in Probability Arjun 257 points 842 views
4 votes
4 answers 1.3K views
GATE CSE 2021 Set 2 | Question: 33 | Video Solution
A bag has $r$ red balls and $b$ black balls. All balls are identical except for their colours. In a trial, a ball is randomly drawn from the bag, its colour is noted and the ball is placed back into the bag along with another ball of the same colour. Note that the number of balls in the bag will ...
asked Feb 18 in Probability Arjun 257 points 1.3K views
2 votes
1 answer 1.2K views
GATE CSE 2021 Set 1 | GA Question: 8 | Video Solution
There are five bags each containing identical sets of ten distinct chocolates. One chocolate is picked from each bag. The probability that at least two chocolates are identical is __________ $0.3024$ $0.4235$ $0.6976$ $0.8125$
asked Feb 18 in Numerical Ability Arjun 257 points 1.2K views
2 votes
2 answers 794 views
GATE CSE 2021 Set 1 | Question: 18 | Video Solution
The lifetime of a component of a certain type is a random variable whose probability density function is exponentially distributed with parameter $2$. For a randomly picked component of this type, the probability that its lifetime exceeds the expected lifetime (rounded to $2$ decimal places) is ____________.
asked Feb 18 in Probability Arjun 257 points 794 views
1 vote
1 answer 582 views
GATE CSE 2021 Set 1 | Question: 35 | Video Solution
Consider the two statements. $S_1:\quad$ There exist random variables $X$ and $Y$ such that $ \left(\mathbb E[(X-\mathbb E(X))(Y-\mathbb E(Y))]\right)^2>\textsf{Var}[X]\textsf{Var}[Y]$ $S_2:\quad$ For all random variables $X$ ... Both $S_1$ and $S_2$ are true $S_1$ is true, but $S_2$ is false $S_1$ is false, but $S_2$ is true Both $S_1$ and $S_2$ are false
asked Feb 18 in Probability Arjun 257 points 582 views
3 votes
2 answers 670 views
GATE CSE 2021 Set 1 | Question: 54 | Video Solution
A sender $(\textsf{S})$ transmits a signal, which can be one of the two kinds: $H$ and $L$ with probabilities $0.1$ and $0.9$ respectively, to a receiver $(\textsf{R})$. In the graph below, the weight of edge $(u,v)$ is the probability of receiving $v$ ... $0.7$. If the received signal is $H,$ the probability that the transmitted signal was $H$ (rounded to $2$ decimal places) is __________.
asked Feb 18 in Probability Arjun 257 points 670 views
0 votes
1 answer 24 views
Made easy postal course
A bag contains 5 black, 2 red and 3 white marbles. Three marbles are drawn simultaneously. The probability that the drawn marbles are of the different color is ?
A bag contains 5 black, 2 red and 3 white marbles. Three marbles are drawn simultaneously. The probability that the drawn marbles are of the different color is ?
asked Jan 19 in Probability dilip2812 7 points 24 views
1 vote
1 answer 38 views
Probablity engineering mathematics
A box contains 10 apples out of which 4 are rotten. Two apples are taken out together if one of them is good what is the probablity that the other one is also good. Note: Please don’t use ‘C’ combination terms in your answer rather try to make it as clear as possible.
A box contains 10 apples out of which 4 are rotten. Two apples are taken out together if one of them is good what is the probablity that the other one is also good. Note: Please don’t use ‘C’ combination terms in your answer rather try to make it as clear as possible.
asked Jan 17 in Mathematical Logic donniedarko 39 points 38 views
0 votes
0 answers 31 views
Previous year question
In this previous year question https://gateoverflow.in/179371/, can someone PLEASE explain why is it wrong to say that if i have probability of success = $\frac{1}{26^{10}}$ ... ? Please give a proper reason like, the reason why we can't say the answer is B is because checking is a dependent event.
In this previous year question https://gateoverflow.in/179371/, can someone PLEASE explain why is it wrong to say that if i have probability of success = $\frac{1}{26^{10}}$ ... selected answer? Please give a proper reason like, the reason why we can't say the answer is B is because checking is a dependent event.
asked Jan 9 in Probability reboot 5 points 31 views
0 votes
1 answer 44 views
What is the actual formula for the efficiency in CSMA/CD?
Let there are $n$ devices in the setup. Let each device sends data with a probability $p$ ... (Simply because in the $\dagger$ they assume $c=e$ which is not correct. Which is the correct one and which one to follow?
asked Dec 8, 2020 in Computer Networks HitechGa 9 points 44 views
0 votes
0 answers 38 views
Probability NCERT Book Doubt
The probability of number of defectives in a lot is 35%. There are 4 items taken out with replacement. Find the probability that none of the items are defective?
The probability of number of defectives in a lot is 35%. There are 4 items taken out with replacement. Find the probability that none of the items are defective?
asked Nov 30, 2020 in Probability Dheera -14 points 38 views
0 votes
1 answer 29 views
Probability Binomial Distribution NCERT Doubt
In a hurdle race, a player has to cross 10 hurdles. The probability that he will clear each hurdle is 5/6 . What is the probability that he will knock down fewer than 2 hurdles?
In a hurdle race, a player has to cross 10 hurdles. The probability that he will clear each hurdle is 5/6 . What is the probability that he will knock down fewer than 2 hurdles?
asked Nov 30, 2020 in Probability Dheera -14 points 29 views
1 vote
1 answer 50 views
Probability ncert doubt
Find the probability that at most 2 heads and at most 2 tails occur when 4 coins are tossed simultaneously?
Find the probability that at most 2 heads and at most 2 tails occur when 4 coins are tossed simultaneously?
asked Nov 29, 2020 in Probability Dheera -14 points 50 views
0 votes
0 answers 23 views
Bayes Theorem self doubt
A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are drawn and are found to be both diamonds. Find the probability of the lost card being a diamond.
A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are drawn and are found to be both diamonds. Find the probability of the lost card being a diamond.
asked Nov 27, 2020 in Probability Dheera -14 points 23 views
1 vote
1 answer 42 views
TIFR 2020 From System Science
Balls are drawn one after the other uniformly at random without replacement from a set of eight balls numbered 1,2,...,8 until all balls drawn what is expected number of balls whose value matched their ordinality (i.e their position in the order in which ... that the i-th ball is drawn at the i-th draw ? now can you use linearity of expectation to solve the problem
Balls are drawn one after the other uniformly at random without replacement from a set of eight balls numbered 1,2,...,8 until all balls drawn what is expected number of balls whose value matched their ordinality (i.e their position in the order in which balls were drawn ... the probability that the i-th ball is drawn at the i-th draw ? now can you use linearity of expectation to solve the problem
asked Nov 26, 2020 in Probability Dhruvil 11 points 42 views
0 votes
0 answers 21 views
Probability # Self doubt # GO test
How to solve this calculation step by step ? Ans is 99.56%.
How to solve this calculation step by step ? Ans is 99.56%.
asked Oct 22, 2020 in Mathematical Logic Sharma9999999 5 points 21 views
0 votes
0 answers 19 views
Exponential Distribution (probability) - self doubts
What is Exponential Distribution in Probability?? Please discuss it with example!!! Thank you!!!
asked Sep 21, 2020 in Probability Dipankar Giri 5 points 19 views
0 votes
0 answers 16 views
Uniform Distribution (Probability)-Self doubts
What is Uniform Distribution in Probability?? Please discuss it with example!!! Thank you!!!
What is Uniform Distribution in Probability?? Please discuss it with example!!! Thank you!!!
asked Sep 21, 2020 in Probability Dipankar Giri 5 points 16 views
1 vote
1 answer 56 views
Gravner Probability Exercise
asked Sep 7, 2020 in Probability Mellophi 363 points 56 views
1 vote
4 answers 256 views
probability basic
In a family with 4 children, what is the probability of a 2:2 boy-girl split?
In a family with 4 children, what is the probability of a 2:2 boy-girl split?
asked Aug 20, 2020 in Probability akshita_jain 17 points 256 views
0 votes
1 answer 47 views
Combinatorics and Probability
Six people, including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "B is between A and C in the queue". What is its probability? (The order of A and C can be arbitrary, but B should be between them).
Six people, including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "B is between A and C in the queue". What is its probability? (The order of A and C can be arbitrary, but B should be between them).
asked Aug 5, 2020 in Probability aryashah2k 2 points 47 views
0 votes
2 answers 387 views
Combinatorics and Probability
Six people including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "A precedes B in the queue". (Again this event does not mention C or other people in the queue. It happens when A is ... not require that B is the next after A, some people could be between A and B.) What is the probability of this event?
Six people including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "A precedes B in the queue". (Again this event does not mention C or other people in the queue. It happens when A is closer to the start of the ... B, and does not require that B is the next after A, some people could be between A and B.) What is the probability of this event?
asked Aug 5, 2020 in Probability aryashah2k 2 points 387 views
0 votes
2 answers 164 views
TCS MockVita 2020 , Lazy Student
There is a test of Algorithms. Teacher provides a question bank consisting of N questions and guarantees all the questions in the test will be from this question bank. Due to lack of time and his laziness, Codu could only practice M questions. There ... problems. Codu can't solve the question he didn't practice. What is the probability that Codu will pass the test?
There is a test of Algorithms. Teacher provides a question bank consisting of N questions and guarantees all the questions in the test will be from this question bank. Due to lack of time and his laziness, Codu could only practice M questions. There are T questions in a ... of the T problems. Codu can't solve the question he didn't practice. What is the probability that Codu will pass the test?
asked Jul 2, 2020 in Probability pravincesingh 5 points 164 views
0 votes
0 answers 18 views
PROBABILTY AND DISTRIBUTIONS
A elevator manufacturing company believes that 'X' is the amount of that can elevator withstand without any damage with is mean 100 and standard deviation 10. This elevator is used to lift the company staff persons with mean 5 and standard deviation 0.5. How many staff person would have to be in the elevator for the probability of No damage exceeds to 0.85.
A elevator manufacturing company believes that 'X' is the amount of that can elevator withstand without any damage with is mean 100 and standard deviation 10. This elevator is used to lift the company staff persons with mean 5 and standard deviation 0.5. How many staff person would have to be in the elevator for the probability of No damage exceeds to 0.85.
asked Jun 30, 2020 in Mathematical Logic Stanfordboi 5 points 18 views
0 votes
1 answer 19 views
What are the relevant chapter in Gravner for Probability ?
What are the Topics of Gravner that are related to GATE?
asked Jun 26, 2020 in Probability Raj_81 23 points 19 views
0 votes
1 answer 26 views
#self doubt why is the method wrong to solve the problem
From a pack of 52 playing cards, three cards are drawn at random. The Probability of drawing a King, Queen and a jack can somebody please tell why is the following method wrong: (4/52)*(4/51)*(4/50) actual answer is 16/5525
asked Jun 12, 2020 in Probability abhijeet at 9 points 26 views
0 votes
2 answers 27 views
#A First Course In Probability Sheldon Ross #self_doubt
Five separate awards (best scholarship, best leadership qualities, and so on) are to be presented to selected students from a class of 30. How many different outcomes are possible if a student can receive any number of awards? //I do understand the approach that gives 30^5, but if someone can help me to point out the flaw in my approach.
asked May 21, 2020 in Probability Neelam_$ingh_222 5 points 27 views
0 votes
1 answer 101 views
A first course in probability by Ross
A basketball team consists of 6 frontcourt and 4 backcourt players. If players are divided into roommates at random, what is the probability that there will be exactly two roommate pairs made up of a backcourt and a frontcourt player?
A basketball team consists of 6 frontcourt and 4 backcourt players. If players are divided into roommates at random, what is the probability that there will be exactly two roommate pairs made up of a backcourt and a frontcourt player?
asked May 21, 2020 in Probability Neelam_$ingh_222 5 points 101 views
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