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Recent questions tagged expectation

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1 answer

1

Made Easy Mock -1
how to approach this question?

TusharKumar asked in Probability Dec 30, 2022

277 views

1 vote

1 answer

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Probability Doubt
The expected number of times a 6 appears when a fair die is rolled 10 times is equal to?

Manisha Jaishwal asked in Probability Dec 10, 2022

by Manisha Jaishwal

214 views

0 votes

2 answers

3

TIFR CSE 2022 | Part A | Question: 2
We would like to invite a minimum number $n$ of people (their birthdays are independent of each other) to a party such that the expected number of pairs of people that share the same birthday is at least $1.$ What should $n$ be? (Ignore leap years, so ... birthdays fall with equal probability on each of the $365$ days of the year.) $23$ $28$ $92$ $183$ $366$

Lakshman Patel RJIT asked in Probability Sep 1, 2022

by Lakshman Patel RJIT

303 views

2 votes

1 answer

4

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___

LRU asked in Probability Nov 7, 2021

by LRU

382 views

2 votes

1 answer

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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? $8$ $4$ $5.5$ $7.5$ $4.5$

soujanyareddy13 asked in Probability Mar 25, 2021

by soujanyareddy13

780 views

4 votes

1 answer

6

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 __________ $2.5$ $5.0$ $25.0$ $50.0$

Arjun asked in Quantitative Aptitude Feb 20, 2021

by Arjun

1.4k views

16 votes

4 answers

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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 $16$.

Arjun asked in Probability Feb 18, 2021

by Arjun

4.3k views

6 votes

2 answers

8

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

Lakshman Patel RJIT asked in Probability Feb 10, 2020

by Lakshman Patel RJIT

1.9k views

2 votes

1 answer

9

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 $4$ $0$ $\Sigma_{i=0}^{\infty} i P(X=i+4)$ $\Sigma_{i=4}^{\infty} i P(X=i-4)$

Arjun asked in Probability Sep 23, 2019

by Arjun

893 views

1 vote

1 answer

10

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 $E^2[X]$?

akash.dinkar12 asked in Algorithms Jun 28, 2019

by akash.dinkar12

335 views

0 votes

1 answer

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Ace Test Series: Probability - Uniform Distribution

Na462 asked in Probability Feb 2, 2019

by Na462

683 views

2 votes

1 answer

12

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 _______.

cocgame asked in Probability Jan 5, 2019

3.1k views

1 vote

0 answers

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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=aX-bY+1. Find a and b when E(Z)=1 and Var(Z)=1.

Shubhgupta asked in Probability Jan 3, 2019

642 views

2 votes

2 answers

14

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

rekhameena asked in Probability Nov 22, 2018

638 views

2 votes

2 answers

15

ISI2016-MMA-9
Suppose $X$ and $Y$ are two independent random variables both following Poisson distribution with parameter $\lambda$. What is the value of $E(X-Y)^2$ ? $\lambda$ $2 \lambda$ $\lambda^2$ $4 \lambda^2$

go_editor asked in Probability Sep 13, 2018

652 views

0 votes

1 answer

16

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?

ronin_codex asked in Graph Theory Jul 17, 2018

355 views

1 vote

1 answer

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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?

Arjun asked in Probability Jun 10, 2018

by Arjun

140 views

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Recent questions tagged expectation