Random Variables
Wednesday, 10 October 2018
9:00 PM
A random variable is discrete if its image (the range of the variable as a function) is countable
Probability Distribution of a discrete random variable - function 
for 
Cumulative distribution function of a random variable given by
for 
Let be the random variable that counts the number
of heads in four tosses of a coin
- Find the probability distribution of X
|
|
0 |
1 |
2 |
3 |
4 |
|
|
1/16 |
4/16 |
6/16 |
4/16 |
1/16 |
- Sketch the probability distribution
-> Line graph
- Sketch the probability histogram
->
Bar graph, with points at centre
-> The area of columns is proportional to the probability given by the area