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Recent questions tagged probability

1 vote

1 answer

841

Sheldon Ross Normal Variable
In the below question my query is for (a) part When we are calculating $P\left \{ \frac{-1}{3}< Z< \frac{2}{3} \right \}$ I know that the normal variable X is converted to standard normal variable and then we look for values in normal table but I want to know how the third step came? Please explain anyone.

Ayush Upadhyaya asked in Probability Dec 11, 2017

by Ayush Upadhyaya

530 views

1 vote

1 answer

842

Testbook Mock Test (DM + Probability)
Ram draws an empty graph of 6 nodes and tosses a fair die for every pair of distinct nodes, if a prime number occurs he draws an edge between the respective pair otherwise he moves on without drawing edge between that pair. What is the probability that after the end of ... a randomly chosen node will have degree 2? (a) 5/16 (b) 1/2 (c) 3/8 (d) None of the above

rfzahid asked in Probability Dec 11, 2017

609 views

0 votes

2 answers

843

Probability
From a gift pack of 5 items, 3 items are drawn, found that all of them are in red color. What is the probability that all are red?

atul_21 asked in Probability Dec 11, 2017

320 views

3 votes

1 answer

844

online examination
if 8 coins are tossed then find the probability that no two heads appear consecutively??

sushmita asked in Mathematical Logic Dec 11, 2017

531 views

17 votes

2 answers

845

TIFR CSE 2018 | Part A | Question: 13
A hacker knows that the password to the TIFR server is $10$-letter string consisting of lower-case letters from the English alphabet. He guesses a set of $5$ distinct $10$-letter strings (with lower-case letters) uniformly at random. What is the probability that one of the ... $ \frac{1}{(26)^{10}}$ None of the above

Rohit Gupta 8 asked in Probability Dec 10, 2017

by Rohit Gupta 8

2.0k views

17 votes

3 answers

846

TIFR CSE 2018 | Part A | Question: 15
Suppose a box contains $20$ balls: each ball has a distinct number in $\left\{1,\ldots,20\right\}$ written on it. We pick $10$ balls (without replacement) uniformly at random and throw them out of the box. Then we check if the ball with number $\text{ 1"}$ ... $\text{ 2"}$ on it is present in the box? $9/20$ $9/19$ $1/2$ $10/19$ None of the above

Rohit Gupta 8 asked in Probability Dec 10, 2017

by Rohit Gupta 8

2.7k views

7 votes

2 answers

847

TIFR CSE 2018 | Part A | Question: 10
Let $C$ be a biased coin such that the probability of a head turning up is $p.$ Let $p_n$ denote the probability that an odd number of heads occurs after $n$ tosses for $n \in \{0,1,2,\ldots \},$ ... $p_{n}=1 \text{ if } n \text{ is odd and } 0 \text{ otherwise}.$

Arjun asked in Probability Dec 10, 2017

by Arjun

2.1k views

0 votes

0 answers

848

Continous_Probability
Consider the two independent random variable X and Y having probability density functions uniform in the interval [0,1] The probability that X+Y>1.5 : $a)\frac{1}{4}$ $b)\frac{1}{2}$ $c)\frac{1}{3}$ $d)\frac{3}{8}$ $e)None \ of \ these$

saxena0612 asked in Probability Dec 7, 2017

604 views

2 votes

1 answer

849

Gambler and Four Coins
A Gambler has four coins in his pocket. Two are double-headed, one is double-tailed and one is normal coin. The coins cannot be distinguished until one looks at them. The gambler takes a coin at random, opens his eyes and sees that the upper face of the coin is the head. What is the probability that the lower face is a head? Given answer is 4/5. I think it should be 2/3.

Shubhanshu asked in Probability Dec 6, 2017

885 views

0 votes

0 answers

850

Parshu gate asked in Probability Dec 5, 2017

627 views

0 votes

1 answer

851

Probability question on Coupons
Suppose there are M different coupons. All coupons are equally likely to come. You collected your Nth coupon. What is the probability that a) Your current coupon is different than what you had in your hand just before it? (different than all ... ) b) You have all distinct coupons till this time? c) Expected number of different types of coupon you have currently.

Ahwan asked in Probability Dec 5, 2017

by Ahwan

408 views

0 votes

2 answers

852

Sheldon Ross Example 3.7f
A plane is missing and it is presumed that it was equally likely to have gone down in any of three possible regions. Let 1 − αi denote the probability the plane will be found upon a search of the ith region when the plane is, in fact, in that ... conditional probability that the plane is in the ith region, given that a search of region 1 is unsuccessful, i = 1, 2, 3?

Ahwan asked in Probability Dec 3, 2017

by Ahwan

1.8k views

1 vote

1 answer

853

probability
a dice is tossed seven times what is the probability that all six faces appear at least once? a)63/64 b)35/648 c)2/9 d)5/324

aaru14 asked in Verbal Aptitude Dec 3, 2017

by aaru14

744 views

0 votes

1 answer

854

MadeEasy Test Series 2017: Probability - Conditional Probability
Hi Guys, I think final answer of following question should be 0.47. Please correct me if i am wrong.

Chhotu asked in Probability Dec 1, 2017

by Chhotu

484 views

2 votes

1 answer

855

Parshu gate asked in Probability Nov 28, 2017

297 views

1 vote

0 answers

856

Probability of processor time utilization
A process spends 25% of the time waiting for the I/O to complete. If there are 3 processes in the memory at a time, then the probability of CPU time utilized is ____________________

Tuhin Dutta asked in Operating System Nov 27, 2017

408 views

0 votes

1 answer

857

probability
A jewelry showroom has announced “500” vehicles prizes, out of which 200 are cars and 300 are bikes. Showroom has purchased 120 bikes and 25 cars from Suzuki and 100 bikes and 150 cars from Mahindra, 80 bikes and 25cars from BMW. What is the probability that a person who won a bike, which is of Suzuki company

Parshu gate asked in Probability Nov 27, 2017

672 views

1 vote

1 answer

858

Previous Gate
The second moment of a Poisson-distributed random variable is 2. The mean of the variable is .... My question on solving we get 2 values of lamda(ie mean) .One is -2 and the other is 1 .So which one to choose?

Kalpataru Bose asked in Mathematical Logic Nov 23, 2017

by Kalpataru Bose

4.7k views

0 votes

0 answers

859

Probability
In an area, it rains once in every three days. The local evening newspaper attempts to predict whether it rains or not in the following day. Three quarters of rainy days and three fifths of dry days are correctly predicted by the previous evening’s paper. Given that this evening’s paper predicts rain, what is the probability that it will actually rain tomorrow?

just_bhavana asked in Probability Nov 18, 2017

by just_bhavana

1.2k views

3 votes

0 answers

860

Probability 2 marks question
You purchase a certain product. The manual states that the lifetime TT of the product, defined as the amount of time (in years) the product works properly until it breaks down, satisfies P(T≥t)=e−t5, for all t≥0.P(T≥t)=e−t5, for all t≥0. ... purchase the product and use it for two years without any problems. What is the probability that it breaks down in the third year?

Parshu gate asked in Computer Networks Nov 13, 2017

401 views

2 votes

0 answers

861

#PROBABILITY
Is there any relation between independent events and mutually exclusive events?

itsvkp1 asked in Probability Nov 13, 2017

296 views

1 vote

0 answers

862

Normal Distribution
Can any one say how to solve Z score questions like below 1) P(1≤Z≤30) = ? 2) P(z>2.5)=? 3) P(z<=k) = 0.9 find k? Will they give any related values of Z-scores in exam ?

Anjan asked in Probability Nov 12, 2017

by Anjan

510 views

4 votes

2 answers

863

probability
Consider a coin with probability P to be heads. What is the probability that the first head will appear on the even numbered tosses? (A) (1 - P) / 2 (B) (1 - P) / (2 - P) (C) (1 - P) / (3 - P) (D) 1 / (P (1 - P))

Parshu gate asked in Probability Nov 11, 2017

604 views

1 vote

0 answers

864

Range of covariance and correlation coefficient
Hi Guys, How can we prove following $\rightarrow$ $-\infty \leq Covariance(X,Y) \leq +\infty$ and $ -1 \leq correlationCoefficient(X,Y) \leq +1$

Chhotu asked in Probability Nov 11, 2017

by Chhotu

390 views

2 votes

2 answers

865

A First Course in Probability- Sheldon Ross 8th Edition Random Variables Example 1b
Three balls are to be randomly selected without replacement from an urn containing 20 balls numbered 1 through 20. If we bet that at least one of the balls that are drawn has a number as large as or larger than 17, what is the probability that we win the bet?

Bhunesh Singh asked in Probability Nov 10, 2017

by Bhunesh Singh

897 views

0 votes

1 answer

866

Parshu gate asked in Probability Nov 6, 2017

258 views

0 votes

1 answer

867

Gate 2012 CE Probability
The annual precipitation data of a city is normally distributed with mean and standard deviation as $1000$ $mm$ and $200$ $mm$, respectively. The probability that the annual precipitation will be more than $1200$ $mm$ is $<50\%$ $50\%$ $75\%$ $100\%$

charul asked in Probability Nov 1, 2017

by charul

2.6k views

1 vote

1 answer

868

Probability
Suppose two dies are rolled .What is the probability of getting 4 on the first die , when the the sum is 6 ? A) 1/5 B)1/6

NIKU asked in Probability Oct 31, 2017

by NIKU

476 views

1 vote

2 answers

869

set2018 asked in Mathematical Logic Oct 29, 2017

307 views

3 votes

1 answer

870

Shivam Chauhan asked in Probability Oct 25, 2017

by Shivam Chauhan

523 views

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Recent questions tagged probability