Discrete random variable
- how to find random variable in probability
- how to calculate random variable probability
- what is random variable in probability
- how to find random variable in statistics
How to find random variable in statistics
Continuous random variable!
Random Variables
A Random Variable is a set of possible values from a random experiment.
Example: Tossing a coin: we could get Heads or Tails.
Let's give them the values Heads=0 and Tails=1 and we have a Random Variable "X":
In short:
X = {0, 1}
Note: We could choose Heads=100 and Tails=150 or other values if we want!
It is our choice.
So:
- We have an experiment (such as tossing a coin)
- We give values to each event
- The set of values is a Random Variable
Not Like an Algebra Variable
In Algebra a variable, like x, is an unknown value:
Example: x + 2 = 6
In this case we can find that x=4
But a Random Variable is different ...
A Random Variable has a whole set of values ...
...
and it could take on any of those values, randomly.
Example: X = {0, 1, 2, 3}
X could be 0, 1, 2, or 3 randomly.
And they might each have a different probability.
Capital Letters
We use a capital letter, like X or Y, to avoid confusion with the Algebra type of variable.
Sample Space
A Random Variable's set of values is the Sample Space
- how to find random variable x
- how do you find the value of a random variable