4- Discrete Random Variables

Question 1

Random variable

Answer 1

As a result of a chance situation- value depends on a chance. We have a range of possible outcomes and a set of probabilities associated to them.
E.g. number I get when throwing a die.

Question 2

Discrete variable

Answer 2

Only finite values within a range

Question 3

Continous variable

Answer 3

Sample space has an infinite number of outcomes.

Question 4

Mean of a random variable

Answer 4

Sum of all x’s multiplied by probabilities

Question 5

Variance of a random variable

Answer 5

Check book

Question 6

Binomial formula

Answer 6

nCx= n!/ x! (n-x)!

Question 7

Binomial probability

Answer 7

number of trials x probability

Question 8

Variance of binomial distribution

Answer 8

= nP (1-P)

Question 9

Poisson distribution

Answer 9

Check book