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# How do you find the maximum of a random variable?

## How do you find the maximum of a random variable?

The maximum max(x1,x2) is itself a random variable, similar to e.g. the sum x1+x2. If x1, x2 are dice rolls, max(x1,x2) will be “the higher of the two values rolled”.

What is the maximum of two random variables?

This is the “average” configuration of two random points on a interval and, as you see, the maximum value is two-thirds of the way from the left endpoint. Hence, P(X=x,Y=y) is indeed a probability density function.

What is a uniform random variable?

Uniform random variables are used to model scenarios where the expected outcomes are equi-probable. For example, in a communication system design, the set of all possible source symbols are considered equally probable and therefore modeled as a uniform random variable.

### How is the maximum of a set of IID random variables distributed?

The maximum of a set of IID random variables when appropriately normalized will generally converge to one of the three extreme value types. This is Gnedenko’s theorem,the equivalence of the central limit theorem for extremes. The particular type depends on the tail behavior of the population distribution.

Are max and min independent random variables?

1 Answer. If X and Y are independent continuous random variables, then max(X,Y) and min(X,Y) are independent random variables if and only if one of the following two conditions holds: P(X>Y)=1.

What does Max X1 X2 mean?

By identically distributed we mean that X1 and X2 each have the same distribution function F (and therefore the same density function f). max{X1,X2} ≤ x if and only if both X1 ≤ x and X2 ≤ x and min{X1,X2} > x if and only if both X1 > x and X2 > x.

## What does Max mean in probability?

The maximum max(x1,x2) is itself a random variable, similar to e.g. the sum x1+x2. If x1, x2 are dice rolls, max(x1,x2) will be “the higher of the two values rolled”. If you take any point in the sample space (informally: each time you run the experiment), you get actual values for x1 and x2.

What is the expected value of a uniform random variable?

SOLUTION. Or, in other words, the expected value of a uniform [α,β] random variable is equal to the midpoint of the interval [α,β], which is clearly what one would expect.

How do you find the uniform random variable?

The general formula for the probability density function (pdf) for the uniform distribution is: f(x) = 1/ (B-A) for A≤ x ≤B. “A” is the location parameter: The location parameter tells you where the center of the graph is. “B” is the scale parameter: The scale parameter stretches the graph out on the horizontal axis.

### What is the expectation of a uniform distribution?

How do you find the minimum of a random variable?

If the cdf of Xi is denoted by F(x), then the cdf of the minimum is given by 1−[1−F(x)]n. If the CDF of Xi is denoted by F(x), then the CDF of the minimum is given by 1−[1−F(x)]n.

What is the largest number a random variable can be drawn?

This also makes sense! If we take the maximum of 1 or 2 or 3 ‘s each randomly drawn from the interval 0 to 1, we would expect the largest of them to be a bit above , the expected value for a single uniform random variable, but we wouldn’t expect to get values that are extremely close to 1 like .9.

## Are \$X\$ and \$y\$ uniformly distributed random variables?

All of this holds regardless of the distributions of \$X\$ and \$Y\$, that is, they need not be uniformly distributed random variables. But, for uniform distributions, the density of \$Z\$ has simple form since \$f_X(z)\$ and \$f_Y(z)\$ are constants and \$F_X(z)\$ and \$F_Y(z)\$ are constants or linearly increasing functions of \$z\$.

What is the minimum variance unbiased estimator for a uniform distribution?

Given a uniform distribution on [0, b] with unknown b, the minimum-variance unbiased estimator (UMVUE) for the maximum is given by. where m is the sample maximum and k is the sample size, sampling without replacement (though this distinction almost surely makes no difference for a continuous distribution).

What is continuous uniform distribution in statistics?

Uniform distribution (continuous) In probability theory and statistics, the continuous uniform distribution or rectangular distribution is a family of symmetric probability distributions such that for each member of the family, all intervals of the same length on the distribution’s support are equally probable.