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Recent questions tagged expectation
2
votes
1
answer
31
Applied Test Series
A final exam is a discrete mathematics course consisting of 20 true-false questions, each worth 3 points and 10 multiple choice questions, each worth 4 points. Suppose that the probability that a student gives a correct answer to a true-false question is ... student gives a correct answer to a multiple choice question is 0.8. What is student expected score on the final exam___
A final exam is a discrete mathematics course consisting of 20 true-false questions, each worth 3 points and 10 multiple choice questions, each worth 4 points. Suppose th...
LRU
559
views
LRU
asked
Nov 7, 2021
Probability
test-series
engineering-mathematics
probability
expectation
+
–
2
votes
2
answers
32
TIFR CSE 2021 | Part B | Question: 11
Suppose we toss a fair coin (i.e., both beads and tails have equal probability of appearing) repeatedly until the first time by which at least $\textit{two}$ heads and at least $\textit{two}$ tails have appeared in the sequence of tosses made. What is the expected number of coin tosses that we would have to make? $8$ $4$ $5.5$ $7.5$ $4.5$
Suppose we toss a fair coin (i.e., both beads and tails have equal probability of appearing) repeatedly until the first time by which at least $\textit{two}$ heads and at...
soujanyareddy13
1.4k
views
soujanyareddy13
asked
Mar 25, 2021
Probability
tifr2021
probability
expectation
+
–
4
votes
1
answer
33
GATE Electrical 2021 | GA Question: 8
Let $X$ be a continuous random variable denoting the temperature measured. The range of temperature is $[0, 100]$ degree Celsius and let the probability density function of $X$ be $f\left ( x \right )=0.01$ for $0\leq X\leq 100$. The mean of $X$ is __________ $2.5$ $5.0$ $25.0$ $50.0$
Let $X$ be a continuous random variable denoting the temperature measured. The range of temperature is $[0, 100]$ degree Celsius and let the probability density function ...
Arjun
2.2k
views
Arjun
asked
Feb 19, 2021
Quantitative Aptitude
gateee-2021
quantitative-aptitude
probability
probability-density-function
expectation
+
–
27
votes
4
answers
34
GATE CSE 2021 Set 2 | Question: 29
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 ... $22$. First $\textsf{QuesA}$ and then $\textsf{QuesB}$. Expected marks $16$.
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...
Arjun
7.6k
views
Arjun
asked
Feb 18, 2021
Probability
gatecse-2021-set2
probability
expectation
2-marks
+
–
6
votes
2
answers
35
TIFR CSE 2020 | Part A | Question: 1
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
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 dr...
admin
2.4k
views
admin
asked
Feb 10, 2020
Probability
tifr2020
engineering-mathematics
probability
expectation
+
–
2
votes
1
answer
36
ISI2015-MMA-53
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 $4$ $0$ $\Sigma_{i=0}^{\infty} i P(X=i+4)$ $\Sigma_{i=4}^{\infty} i P(X=i-4)$
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 $4$ c...
Arjun
1.2k
views
Arjun
asked
Sep 23, 2019
Probability
isi2015-mma
poisson-distribution
expectation
+
–
1
votes
1
answer
37
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 $E^2[X]$?
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 $E^2[X]$?
akash.dinkar12
770
views
akash.dinkar12
asked
Jun 28, 2019
Algorithms
cormen
algorithms
sorting
bucket-sort
expectation
descriptive
+
–
0
votes
1
answer
38
Ace Test Series: Probability - Uniform Distribution
Na462
964
views
Na462
asked
Feb 2, 2019
Probability
random-variable
probability
expectation
uniform-distribution
ace-test-series
+
–
2
votes
1
answer
39
GATE 2015 SET-2 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 _______.
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 _____...
cocgame
3.9k
views
cocgame
asked
Jan 5, 2019
Probability
probability
usergate2015
usermod
expectation
+
–
1
votes
0
answers
40
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=aX-bY+1. Find a and b when E(Z)=1 and Var(Z)=1.
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=aX-bY+1.Find a and b when E(Z)=1 and Var(Z)=1.
Shubhgupta
1.2k
views
Shubhgupta
asked
Jan 2, 2019
Probability
engineering-mathematics
variance
expectation
+
–
2
votes
2
answers
41
made easy test series - 30 cards are drawn at a time out of 80 playing cards numbered from 1 to 80
How to do this question ..please help me guys
How to do this question ..please help me guys
rekhameena
993
views
rekhameena
asked
Nov 22, 2018
Probability
expectation
+
–
2
votes
2
answers
42
ISI2016-MMA-9
Suppose $X$ and $Y$ are two independent random variables both following Poisson distribution with parameter $\lambda$. What is the value of $E(X-Y)^2$ ? $\lambda$ $2 \lambda$ $\lambda^2$ $4 \lambda^2$
Suppose $X$ and $Y$ are two independent random variables both following Poisson distribution with parameter $\lambda$. What is the value of $E(X-Y)^2$ ?$\lambda$$2 \lambd...
go_editor
872
views
go_editor
asked
Sep 13, 2018
Probability
isi2016-mmamma
probability
random-variable
poisson-distribution
expectation
+
–
0
votes
1
answer
43
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?
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 nod...
ronin_codex
464
views
ronin_codex
asked
Jul 17, 2018
Graph Theory
probability
graph-theory
expectation
simple-graph
+
–
1
votes
1
answer
44
GATE Suitability Test | Test 1 | Question: 3
A coin is such that after every toss the probability of same side coming again increases by $50\%$ from the initial value. If initially the probability of head and tail are the same, what is the expected number of tosses until we get a head?
A coin is such that after every toss the probability of same side coming again increases by $50\%$ from the initial value. If initially the probability of head and tail a...
Arjun
327
views
Arjun
asked
Jun 10, 2018
Probability
gate-suitability-test-1
expectation
probability
numerical-answers
+
–
1
votes
0
answers
45
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) ?
Suppose X and Y are random variables such thatE(X) = 1, Var (X) = 1, E(Y) = 2, Var (Y) = 2, Cov (X, Y) = 1By using above values the following expressions are evaluated(i)...
rahul sharma 5
596
views
rahul sharma 5
asked
Jan 18, 2018
Mathematical Logic
engineering-mathematics
probability
expectation
made-easy-test-series
+
–
1
votes
0
answers
46
ISRO 2009-ECE 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
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/2b) nc)...
sh!va
2.3k
views
sh!va
asked
Mar 1, 2017
Probability
isro-ece
engineering-mathematics
expectation
+
–
47
votes
4
answers
47
GATE CSE 2017 Set 2 | Question: 48
If a random variable $X$ has a Poisson distribution with mean $5$, then the expectation $E\left [ \left ( x+2 \right )^{2} \right ]$ equals ___.
If a random variable $X$ has a Poisson distribution with mean $5$, then the expectation $E\left [ \left ( x+2 \right )^{2} \right ]$ equals ___.
Kantikumar
16.5k
views
Kantikumar
asked
Feb 14, 2017
Probability
gatecse-2017-set2
expectation
poisson-distribution
numerical-answers
probability
+
–
0
votes
0
answers
48
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
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...
ldxer23
529
views
ldxer23
asked
Feb 7, 2017
Probability
probability
expectation
+
–
4
votes
2
answers
49
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(n-1)/2n (n+1)/2n ((n-1))/2 ((n+1))/2 /pls explain the question
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 permuta...
Akriti sood
1.7k
views
Akriti sood
asked
Jan 16, 2017
Graph Theory
expectation
graph-theory
engineering-mathematics
+
–
1
votes
1
answer
50
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.
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) - The...
Hardik Vagadia
931
views
Hardik Vagadia
asked
Dec 17, 2016
Mathematical Logic
expectation
probability
engineering-mathematics
+
–
1
votes
1
answer
51
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.
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 co...
dd
672
views
dd
asked
Dec 17, 2016
Probability
expectation
probability
programming-in-c
+
–
1
votes
1
answer
52
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?
A coin is flipped n times. Assuming that the flips are independent, with each onecoming up heads with probability p, what is the probability that there is a string of kco...
sushmita
621
views
sushmita
asked
Dec 8, 2016
Mathematical Logic
probability
expectation
combinatory
+
–
1
votes
1
answer
53
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
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 fir...
thor
669
views
thor
asked
Nov 26, 2016
Combinatory
combinatory
expectation
+
–
2
votes
1
answer
54
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?
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 substrin...
Manu Madhavan
733
views
Manu Madhavan
asked
Nov 17, 2016
Probability
probability
expectation
+
–
3
votes
0
answers
55
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?
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 t...
robertSingh
275
views
robertSingh
asked
Oct 4, 2016
Probability
numerical-answers
quantitative-aptitude
expectation
+
–
6
votes
2
answers
56
GATE Overflow | Algorithms | Test 1 | Question: 4
Consider the following algorithm for searching for a given number $x$ in an unsorted array $A[1...n]$ having $n$ values : Sequentially choose $i$ from 1 to n if A[i] = x then Stop else Goto 1 Let $x$ be present in A two times, what is the expected no of comparisons made by the algorithm before it terminates for $n=5$?
Consider the following algorithm for searching for a given number $x$ in an unsorted array $A[1...n]$ having $n$ values : Sequentially choose $i$ from 1 to n if A[i] = x ...
Bikram
1.6k
views
Bikram
asked
Oct 3, 2016
Algorithms
go-alogrithms-1
algorithms
expectation
numerical-answers
+
–
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