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Recent questions tagged expectation
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ISI2015MMA53
The number of cars $(X)$ arriving at a service station per day follows a Poisson distribution with mean $4$. The service station can provide service to a maximum of $4$ cars per day. Then the expected number of cars that do not get service per day equals $4$ $0$ $\Sigma_{i=0}^{\infty} i P(X=i+4)$ $\Sigma_{i=4}^{\infty} i P(X=i4)$
asked
Sep 23
in
Probability
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Arjun
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isi2015mma
poissondistribution
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Cormen Edition 3 Exercise 8.4 Question 3 (Page No. 204)
Let $X$ be a random variable that is equal to the number of heads in two flips of a fair coin. What is $E[X^2]$? What is $E^2[X]$?
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Jun 28
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Algorithms
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akash.dinkar12
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cormen
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sorting
bucketsort
expectation
descriptive
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2
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Ace Test Series: Probability  Uniform Distribution
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Feb 2
in
Probability
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Na462
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randomvariable
probability
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uniformdistribution
acetestseries
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1
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4
GATE 2015 SET2 Q 29
Let the random variable X represent the number of times a fair coin needs to be tossed till two consecutive heads appear for the first time. The expectation of X is _______.
asked
Jan 5
in
Probability
by
cocgame
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223
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244
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probability
usergate2015
usermod
expectation
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Random Variable
Let X and Y are two random variables with E(X)=10,E(Y)=20 and Var(X)=25,Var(Y)=36 and E(X.Y)=225. Now consider Z=aXbY+1. Find a and b when E(Z)=1 and Var(Z)=1.
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Jan 3
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Probability
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Shubhgupta
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engineeringmathematics
variance
expectation
+1
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2
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made easy test series  30 cards are drawn at a time out of 80 playing cards numbered from 1 to 80
asked
Nov 22, 2018
in
Probability
by
rekhameena
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119
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280
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expectation
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0
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ISI2016MMA9
Suppose $X$ and $Y$ are two independent random variables both following Poisson distribution with parameter $\lambda$. What is the value of $E(XY)^2$ ? $\lambda$ $2 \lambda$ $\lambda^2$ $4 \lambda^2$
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Sep 13, 2018
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Probability
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jothee
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isi2016mmamma
probability
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me test
A simple graph with n vertices is constructed by randomly and independently placing an edge between every two vertices with probability p. What is the expected no. of nodes with degree 2?
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Jul 17, 2018
in
Graph Theory
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ronin_codex
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11
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99
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probability
graphtheory
expectation
simplegraph
+1
vote
0
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9
MadeEasy Test Series: Probability  Expectation
Suppose X and Y are random variables such that E(X) = 1, Var (X) = 1, E(Y) = 2, Var (Y) = 2, Cov (X, Y) = 1 By using above values the following expressions are evaluated (i) E(X + 2Y) = p (ii) E(XY ) = q (iii) Var(X – 2Y + 1) = r The value of pq + r is ___________. What is the formulae for point (iii) ?
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Jan 18, 2018
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Mathematical Logic
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rahul sharma 5
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engineeringmathematics
probability
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10
ISRO 2009ECE Probability
A man with n keys wants to open a lock. He tries his keys at random. The expected number of attempts for his success is (keys are replaced after every attempt) a) n/2 b) n c) √ n d) None of the above
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Mar 1, 2017
in
Probability
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sh!va
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387
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isroece
engineeringmathematics
expectation
+30
votes
4
answers
11
GATE2017248
If a random variable $X$ has a Poisson distribution with mean $5$, then the expectation $E\left [ \left ( x+2 \right )^{2} \right ]$ equals ___.
asked
Feb 14, 2017
in
Probability
by
Kantikumar
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gate20172
expectation
poissondistribution
numericalanswers
probability
0
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0
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12
gatebook
In an examination there are 80 questions each having four choices. Exactly one of these four choices is correct and the other three are wrong. A student is awarded 1 mark for each correct answer, and 0.25 for each wrong answer. If a student ticks the answer of each question randomly, then the expected value of his/her total marks in the examination is. (A) 15 (B) 0 (C) 5 (D) 20
asked
Feb 7, 2017
in
Probability
by
ldxer23
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211
points)

173
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probability
expectation
+4
votes
2
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13
What is the expected length of the cycle containing vertex 1?
A random permutation π of set[n] = {1, 2, , n} can be represent by a directed graph on n vertices with directed arc (i, πi) where πi is the ith entry in the permutation. Observe that the resulting graph is just a collection of disjoint cycles. ... containing vertex 1? n(n1)/2n (n+1)/2n ((n1))/2 ((n+1))/2 /pls explain the question
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Jan 16, 2017
in
Graph Theory
by
Akriti sood
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441
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expectation
graphtheory
engineeringmathematics
0
votes
1
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14
Probability (Expectation)
Suppose that the expectation of a random variable X is 5. Which of the following statements is true? (A)  There is a sample point at which the X has the value 5. (B)  There is a sample point at which the X has the value greater than 5. (C)  There is a sample point at which the X has the value greater than or equal to 5. (D)  None. Explain.
asked
Dec 17, 2016
in
Mathematical Logic
by
Hardik Vagadia
(
339
points)

304
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expectation
probability
engineeringmathematics
+1
vote
1
answer
15
Expected value
in C language rand() returns a random integer number. Following is a function definition. int f() { return (rand() & 1) ? 1:0; } Then what will be the expected value of count ? count = 0; for(i=1;i<=n;i++) { if(f() && f()) { count++; } } & is bitwise AND && is logical AND and assume required seed has been initialized.
asked
Dec 17, 2016
in
Probability
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dd
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251
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expectation
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programminginc
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1
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16
sheldon Ross
A coin is flipped n times. Assuming that the flips are independent, with each one coming up heads with probability p, what is the probability that there is a string of k consecutive heads?
asked
Dec 8, 2016
in
Mathematical Logic
by
sushmita
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150
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probability
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permutationandcombination
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1
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17
Expected valu
I always do expected value questions wrong. Please suggest a detailed way to solve these questions. Suppose a coin is tossed 9 times, with the result $HHHT T T T HT$ The first set of three heads is called a run.There are three more runs in this ... the same value as the first two. Now suppose an experiment consists of tossing a fair coin three times. Find the expected number of runs
asked
Nov 26, 2016
in
Combinatory
by
thor
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148
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permutationandcombination
expectation
+2
votes
1
answer
18
Probability
Let there be a string of 10 bits generated uniformly at random (each bit could be 0 or 1 with equal probability). What is the expected number of appearances of a substring 011 in this string?
asked
Nov 17, 2016
in
Probability
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Manu Madhavan
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1.1k
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183
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probability
expectation
+3
votes
0
answers
19
Maths
Vinod has $1000$ coins. He spreads them on his bed. Initially all of them are facing head. Sachin selects any $57$ coins at random and inverts all of them. Daga repeats this process $12$ times. What is the expected number of head after the process?
asked
Oct 4, 2016
in
Probability
by
robertSingh
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249
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104
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numericalanswers
numericalability
expectation
0
votes
1
answer
20
Expected Value #sheldon and ross
If n balls are randomly selected from an urn containing N balls of which m are white,find the expected number of white balls selected.
asked
Sep 27, 2016
in
Probability
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dd
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190
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expectation
probability
permutationandcombination
+4
votes
3
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21
Expectated no of coin toss
An unbiased coin is tossed repeatedly and outcomes are recorded. What is the expected no of toss to get HT ( one head and one tail consecutively) ?
asked
Sep 24, 2016
in
Probability
by
dd
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56.9k
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712
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discretemathematics
probability
expectation
counting
+1
vote
3
answers
22
Probability Expectaiton
A box contain 2 red balls and 3 white balls. The random experiment is picking two balls from the box. When 2 white balls picked, the balls will be replaced and experiment repeated. Otherwise stop the experiment. What is the expected number of repetations?
asked
Aug 31, 2016
in
Mathematical Logic
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Manu Madhavan
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1.1k
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175
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probability
expectation
+6
votes
2
answers
23
Cormen 2nd edition Exercise 11.21
Suppose we use a hash function h to hash n distinct keys into an array T of length m. Assuming simple uniform hashing, what is the expected number of collisions?
asked
Jul 13, 2016
in
Algorithms
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pranjalgennext
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1.3k
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1.5k
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algorithms
hashing
expectation
0
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2
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24
Expected sum value of permutaion
We have a set(A) of N elements. Let's assume elements are e1,e2,e3..etc. Value of each element can be 0 or 1. Another set of N elements(set B) are given, p1,p2,p3..etc. Where p (i) =probability of e (i) to be 1. If we pick a random ... contains 5 elements e1,e2,e3,e4,e5 and we picked a 5 element sequence 1,0,0,1,1. In this case sum = 3. Expected_Value of sum ?
asked
Jun 9, 2016
by
dd
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probability
permutationandcombination
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descriptive
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2
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25
then what is the expected number of games played in the series
If two teams A and B play a bestoffive series, and if team A has a 1/4 chance of winning any game (and team B has 3/4 chance of winning any game), then what is the expected number of games played in the series. (Note that in a bestoffive series, the teams play games until one team has won three games.)
asked
Mar 26, 2016
in
Probability
by
antony
(
5
points)

383
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expectation
+1
vote
1
answer
26
Probability of Successful transmission
Q If probability of frame reaching safely is 0.1 then mean number of transmissions of a frame to make it success is _____. How to solve this question?
asked
Jan 21, 2016
in
Computer Networks
by
UK
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1.6k
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323
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computernetworks
probability
expectation
+4
votes
2
answers
27
Mathematics GATE 2011 probability
A fair die is tossed two times. the probability that 2nd toss results in value greater than first toss is ?
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Jan 3, 2016
in
Probability
by
pC
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gateec
probability
expectation
0
votes
2
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28
Probability Expectation
Out of 2000 families with 4 children each how many families would you expect to have atleast one BOY..?
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Jan 3, 2016
in
Probability
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pC
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probability
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5
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29
expectation
A fair coin is tossed repeatedly till both head and tail appear atleast once. Average no of tosses required is ?
asked
Dec 16, 2015
in
Probability
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Pooja Palod
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31.2k
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1.4k
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gateec2014
expectation
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