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Random Variables
Page 3
Questions (214)
Every discrete random variable is associated with a
____________ _________________.
2 answers
asked anonymously
20 views
We have k independent and identically distributed copies of the discrete uniform random variable Xi, which takes values 1
10 answers
asked anonymously
74 views
Let π be a random variable with density
π(π₯)={πΆ(4π₯βπ₯^2) , 0β€π₯β€3 0 , otherwise where πΆβπ is
1 answer
asked by
xiny
64 views
What is the mean E(X^2) and variance V(X^2) of the random variable X^2 if X is a standard normal variables
1 answer
asked by
John
89 views
What is the mean E(X^2) and variance V(X^2) of the random variable X^2
1 answer
asked by
John
65 views
The random variables X and Y are independent and have the PMFs shown in this diagram;
PX(x) 1, 1/6 2, 3/6 3, 2/6 PY(y) 2, 2/6 3,
2 answers
asked by
ProbablyDumd
90 views
X is a random variable, such that X = 1 with probability 1/4, 2 with probability 3/4. What is the value of var(X^2)? What is the
1 answer
asked by
Mary
172 views
The nth moment of a random variable X is defined to be the expectation E[Xn] of the nth power of X.
Recall that a Bernoulli
2 answers
asked by
Chibuzo Ekenna Ekejiuba
612 views
If two random variables π and π are independent, which conclusion in the
following is not true
1 answer
asked by
badr abdellaoui
338 views
The random variable K is geometric with a parameter which is itself a uniform random variable Q on [0,1]. Find the value
2 answers
asked by
ANON
724 views
The random variables X and Y have a joint PDF of the form fX,Y(x,y)=cβ exp{β12(4x2β8x+y2β6y+13)}.
1 answer
asked by
Anonymous
332 views
Let X1,X2,β¦ be a sequence of independent random variables, uniformly distributed on [0,1] . Define Nn to be the smallest k
7 answers
asked by
anon
2,075 views
Let π and π be independent random variables, uniformly distributed on [0,1]. Let π=min{π,π} and
2 answers
asked by
anon
837 views
Consider an image, in which every pixel takes a value of 1, with probability q, and a value 0, with probability 1βq, where q
11 answers
asked by
Alison
1,485 views
An image , corrupted with noise, has pixels which take the value 1 with probability q and 0 with probability 1βq, with q being
1 answer
asked by
organicCoco
493 views
Let Y be the discrete random variable with probability function
p(y) = (1/2)^(y+1) y = 0, 1, 2,... Find the moment-generating
1 answer
asked by
Jen
420 views
X, is assumed to be a random variable by placing letters of the word βYACHTβ in a hat. If these letters are withdrawn then
6 answers
asked by
Anonymous
497 views
X, is assumed to be a random variable by placing letters of the word βYACHTβ in a hat. If these letters are withdrawn then
1 answer
asked by
Anonymous
406 views
X, is assumed to be a random variable by placing letters of the word βYACHTβ in a hat. If these letters are withdrawn then
1 answer
asked by
Anonymous
424 views
Identify the given random variable as being discrete or continuous.
The number of stories in a specific Manhattan office
2 answers
asked by
John
1,154 views
The time interval T, in minutes, between patient arrivals in an emergency room is a random variable
with exponential density
1 answer
asked by
Alice
399 views
A box contains 6 pagers. Assume any pager selected from the box is done randomly, and hence
selections are independent from each
1 answer
asked by
Steven
458 views
Let X be a Poisson random variable with Β΅ = EX = 0.4 and let Y be another
random such that E[(2Y + 1)2 ] = 10 and E[(Y β 1)2 ]
1 answer
asked by
hassan
443 views
let x and y be continuous random variables having joint density f(xy)=a^2 e^-ay, 0<=X<=Y.
Find the marginal densities of X an Y.
1 answer
asked by
Daminda
391 views
Suppose a random variable X has mean ΞΌX = 6.3, and variance V(X) = 2.2. According to Chebyshev's Theorem, what is the upper
1 answer
asked by
First Time Here :)
395 views
Manhole explosions (usually caused by gas leaks and sparks) are on the rise in your city. On any given day, the manhole cover
1 answer
asked by
qwerty
518 views
Let X be a random variable that takes non-zero values in [1,β), with a PDF of the form
fX(x)=β§β©β¨cx3,0,if xβ₯1,otherwise.
1 answer
asked by
qwerty
649 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
3 answers
asked by
qwerty
885 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
6 answers
asked by
qwerty
1,075 views
Let N be a geometric r.v. with mean 1/p; let A1,A2,β¦ be a sequence of i.i.d. random variables, all independent of N, with mean
6 answers
asked by
A
1,644 views
The random variable U has mean 10 and standard deviation 5.The random variable V is de ned by
V =12(U + 5).Find the mean and
1 answer
asked by
Sunny
414 views
Determine whether the situation calls for a discrete or continuous random variable.
The number of freshmen in the required
4 answers
asked by
KiKi
1,791 views
A bag contains 4 balls, each of which have a positive integer written on it. Let X be the random variable of the value written
1 answer
asked by
stranger
377 views
When rolling a die, is this an example of a discrete or continuous random variable?
1 answer
asked by
Bruce
395 views
If a coin is flipped and it lands on Heads, y, will the value of the random variable Z be greater than or equal to 0?
2 answers
asked by
Ann
1,755 views
Suppose three random variables X , Y , Z have a joint distribution.
PU,PV,W(u,v,w)=toproaba gooas.P(not mov eveuy now) Then, U
2 answers
asked by
flammy
1,727 views
What is the relationship between two new random variables, Y1 and Y2, when defined in terms of i.i.d. Binomial random variables?
1 answer
asked by
Bob
298 views
Suppose that Y is an exponential random variable with parameter (and mean) equal to 2. Find the MAP estimate of Y, given that
2 answers
asked by
AK
7,936 views
What is the probability that the sum of a standard normal random variable, X, and another random variable, Y, is less than or
2 answers
asked by
bobthebuilder
3,386 views
Rewrite:
Consider a bag containing an unknown number of red and blue balls. Let the number of red balls in the bag be denoted as
2 answers
asked by
ram121
4,377 views
Find the variance of the sum of two random variables X and Y if E[X] = 3 and E[XY] = 6.
2 answers
asked by
talismanpower
4,968 views
Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a
4 answers
asked by
Anonymous
758 views
A machine produces ribbon in which flaws occur randomly at an average rate of one flaw in 100m. Find the probability that there
2 answers
asked by
Kelvin
553 views
One reason for standardizing random variables is to measure variables with:
A. dissimilar means and similar standard deviations
1 answer
asked by
Austin
1,171 views
A binomial random variable is based on n = 28 and p = 0.7. Find x2P(x). (Give your answer correct to two decimal places.)
1
2 answers
asked by
Toni
520 views
find an example for random variables X,X',Y,Y' with the following characteristics:
a)X and X' have the same distribution b)X+Y
1 answer
asked by
sanaz
858 views
Biased coin has a 0.4 probability of landing on tails. The random variable x, based on a single toss of the coin, is defined as
2 answers
asked by
Gilbert
592 views
Here is a simple way to create a random variable X that has mean ΞΌ and stan-
dard deviation Ο: X takes only the two values
2 answers
asked by
ami
546 views
Suppose X & Y are two independent stocks' returns with:
E(X) = E(Y) =15% and V(X) = 144, V(Y) = 256 Problem 1. Buy half X and
1 answer
asked by
Matt
343 views
8. A random variable X takes exactly the 5 values 1, 2,3,4,5, all with same probability. The mean of X is
Choose one answer a.
1 answer
asked by
Arun
326 views
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Parent Categories (10)
Conditional probability
Math/Statistics
Mathematics
Probability
Probability & Statistics
Probability and Statistics
Probability Distribution
Probability Theory
Statistics
Statistics and Probability