# Explore Random Variables: Examples & Equations

Recent questions in Random variables
themediamafia73 2022-09-13

## Suppose that X and Y are independent continuous random variables. Show that${\sigma }_{x}y=0$$\to$${\sigma }_{xy}$

Kendra Hudson 2022-09-12

## Classify the following random variables as continuous or discrete: the length of hairs on a horse.

Jaylen Dudley 2022-09-12

## Suppose that ${Y}_{1}$ and ${Y}_{2}$ are independent, standard normal random variables. Find the density

nikakede 2022-09-11

## Explain the difference between how probabilities may be represented for discrete and continuous random variables.

frobirrimupyx 2022-09-11

## Show that, for random variables X and Z, $E\left[\left(X-Y{\right)}^{2}\right]=E\left[{X}^{2}\right]-E\left[{Y}^{2}\right]$ where Y=E[X|Z]

Gaintentavyw4 2022-09-11

## If X and Y are independent random variables with equal variances, find Cov(X+Y,X−Y).

Daniel Paul 2022-09-11

## If X and Y are random variables, what is the meaning of E(XY) ?

Koronicaqn 2022-09-11

## Let X and Y be independent random variables distributed respectively as ${\chi }^{2}\left(m\right)$ and ${\chi }^{2}\left(n\right)$. Find the density of Z = X/(X + Y).

teevaituinomakw 2022-09-11

## Which of the following describe discrete random variables, and which describe continuous random variables? a. The length of time that an exercise physiologist’s program takes to elevate her client’s heart rate to 140 beats per minute b. The number of crimes committed on a college campus per year c. The number of square feet of vacant office space in a large city d. The number of voters who favor a new tax proposal.

Zackary Duffy 2022-09-11

## The joint density function for random variables X and Y is f(x,y) = {C(x+y) if $0\le x\le 3,0\le y\le 2,0$ otherwise. Find the value of the constant C.

Hugh Soto 2022-09-11

## If the random variables x and y have joint density function, then?

foyerir 2022-09-11

## How do you find the variance of the sum of two independent normally distributed random variables, X and Y, if the two variables are correlated? That is, Var(X+Y) = ___ ?

Audrey Mckee 2022-09-11

## Classify each of the following random variables as discrete or continuous. T = winning time in the men's 100-meter dash at a randomly selected international track meet.

cuuhorre76 2022-09-10

## The joint probability mass function of the random variables X, Y, Z is p$\left(1,2,3\right)=p\left(2,1,1\right)=p\left(2,2,1\right)=p\left(2,3,2\right)=\frac{1}{4}$ Find E[XYZ].

Kathryn Sanchez 2022-09-09

## Classify each of the following random variables as discrete or continuous. X = the reported score of a randomly selected senior at your school on the SAT Math test.

dizxindlert7 2022-09-08

## Classify each of the following random variables as discrete or continuous. W = the exact amount of sleep that a randomly selected student from your school got last night.

Hugh Soto 2022-09-08

## Suppose two random variables have standard deviations of 0.10 and 0.23, respectively. What does this tell you about their distributions?

sooxicyiy 2022-09-06