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Recent questions tagged expectation
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TIFR2020A1
Two balls are drawn uniformly at random without replacement from a set of five balls numbered $1,2,3,4,5.$ What is the expected value of the larger number on the balls drawn? $2.5$ $3$ $3.5$ $4$ None of the above
asked
Feb 11
in
Probability
by
Lakshman Patel RJIT

97
views
tifr2020
engineeringmathematics
probability
expectation
+2
votes
1
answer
2
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 24, 2019
in
Probability
by
Arjun

121
views
isi2015mma
poissondistribution
expectation
0
votes
1
answer
3
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 $E^2[X]$?
asked
Jun 28, 2019
in
Algorithms
by
akash.dinkar12

75
views
cormen
algorithms
sorting
bucketsort
expectation
descriptive
0
votes
1
answer
4
Ace Test Series: Probability  Uniform Distribution
asked
Feb 2, 2019
in
Probability
by
Na462

273
views
randomvariable
probability
expectation
uniformdistribution
acetestseries
0
votes
1
answer
5
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, 2019
in
Probability
by
cocgame

628
views
probability
usergate2015
usermod
expectation
0
votes
0
answers
6
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.
asked
Jan 3, 2019
in
Probability
by
Shubhgupta

96
views
engineeringmathematics
variance
expectation
+1
vote
2
answers
7
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

315
views
expectation
0
votes
2
answers
8
ISI2016MMA9
Suppose $X$ and $Y$ are two independent random variables both following Poisson distribution with parameter $\lambda$. What is the value of $E(XY)^2$ ? $\lambda$ $2 \lambda$ $\lambda^2$ $4 \lambda^2$
asked
Sep 13, 2018
in
Probability
by
jothee

126
views
isi2016mmamma
probability
randomvariable
poissondistribution
expectation
0
votes
1
answer
9
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?
asked
Jul 17, 2018
in
Graph Theory
by
ronin_codex

123
views
probability
graphtheory
expectation
simplegraph
+1
vote
0
answers
10
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) ?
asked
Jan 18, 2018
in
Mathematical Logic
by
rahul sharma 5

166
views
engineeringmathematics
probability
expectation
madeeasytestseries
+1
vote
0
answers
11
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
asked
Mar 1, 2017
in
Probability
by
sh!va

528
views
isroece
engineeringmathematics
expectation
+32
votes
4
answers
12
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

5.9k
views
gate20172
expectation
poissondistribution
numericalanswers
probability
0
votes
0
answers
13
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

195
views
probability
expectation
+4
votes
2
answers
14
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
asked
Jan 17, 2017
in
Graph Theory
by
Akriti sood

515
views
expectation
graphtheory
engineeringmathematics
+1
vote
1
answer
15
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

399
views
expectation
probability
engineeringmathematics
+1
vote
1
answer
16
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
by
dd

280
views
expectation
probability
programminginc
+1
vote
1
answer
17
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

170
views
probability
expectation
combinatory
+1
vote
1
answer
18
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

178
views
combinatory
expectation
+2
votes
1
answer
19
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 18, 2016
in
Probability
by
Manu Madhavan

209
views
probability
expectation
+3
votes
0
answers
20
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

119
views
numericalanswers
numericalability
expectation
0
votes
1
answer
21
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
by
dd

211
views
expectation
probability
combinatory
+4
votes
3
answers
22
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

863
views
discretemathematics
probability
expectation
counting
+1
vote
3
answers
23
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
by
Manu Madhavan

193
views
probability
expectation
+7
votes
2
answers
24
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
by
pranjalgennext

1.7k
views
algorithms
hashing
expectation
0
votes
2
answers
25
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 10, 2016
in
Unknown Category
by
dd

327
views
probability
combinatory
expectation
descriptive
0
votes
2
answers
26
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
anonymous

456
views
expectation
+1
vote
1
answer
27
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

395
views
computernetworks
probability
expectation
+4
votes
2
answers
28
Mathematics GATE 2011 probability
A fair die is tossed two times. the probability that 2nd toss results in value greater than first toss is ?
asked
Jan 3, 2016
in
Probability
by
pC

543
views
gateec
probability
expectation
0
votes
2
answers
29
Probability Expectation
Out of 2000 families with 4 children each how many families would you expect to have atleast one BOY..?
asked
Jan 3, 2016
in
Probability
by
pC

1.4k
views
probability
expectation
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