# Explore Random Variables: Examples & Equations

Recent questions in Random variables
batejavizb 2022-09-25

## Classify each of the following random variables as discrete or continuous. X = the pH of a water sample that has been randomly selected from a stream.

Quinlan7g 2022-09-25

## 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[XY+XZ+YZ].

Keenan Conway 2022-09-24

## Let f be a joint density function of a pair of continuous random variables X and Y. What are the expected values of X and Y?

amhailim 2022-09-23

## Let X and Y be independent random variables each having the uniform density on {0,1,...,N}. Find $P\left(X\ge Y\right)$

HypeMyday3m 2022-09-23

## How do binomial and hypergeometric random variables differ? In what respects are they similar?

Hana Buck 2022-09-23

## Determine the correlation coefficient of the random variables X and Y if var(X) = 4, var(Y ) = 2, and var(X + 2Y ) = 15.

Makaila Simon 2022-09-23

## Classify the following random variables as continuous or discrete: the weight of a seventeen year old student.

skauvzc 2022-09-23

## When using the F distribution to test variances from two populations, should the random variables from each population be independent or dependent?

Seamus Mcknight 2022-09-22

## Suppose that the random variables ${Y}_{1}$ and ${Y}_{2}$ have means ${\mu }_{1}$ and ${\mu }_{2}$ and variances ${\sigma }_{1}^{2}$ and ${\sigma }_{2}^{2}$, respectively. Use the basic definition of the covariance of two random variables to establish that $Cov\left({Y}_{1},{Y}_{2}\right)=Cov\left({Y}_{2},{Y}_{1}\right)$.

trkalo84 2022-09-22

## a) What is the variance of the sum of n independent random variables? b) What is the variance of the number of successes when n independent Bernoulli trials, each with probability p of success, are carried out?

Daniella Reyes 2022-09-21

## X and Y are random variables with E [X]=E[Y]=0 and Var[X]=1, Var[Y]=4 and correlation coefficient p=1/2. Find Var[X+Y].

Linda Peters 2022-09-21

## Classify each of the following random variables as discrete or continuous. X = age (in years) of the oldest person that a randomly selected adult has ever met.

maredilunavy 2022-09-21

## Give an example of another continuous random variable (in addition to temperature) and another discrete random variable that would influence the enjoyment of the event. Give the sample space for those random variables.

Karsyn Stafford 2022-09-20

## What is the difference between discrete and continuous random variables ?

Megan Herman 2022-09-20

## How do discrete and continuous random variables differ?

Marcelo Maxwell 2022-09-20

## Two random variables, X and Y, have standard deviations 2.4 and 3.6, respectively. Which one is more likely to take a value close to its mean? Explain your answer.

Logan Knox 2022-09-19

## Let f be a joint density function of a pair of continuous random variables X and Y. What properties does f possess?

yrealeq 2022-09-14