Discrete Random Variables

Question 1

What are discrete variables

Answer 1

Whole numbers that you can measure exactly

Question 2

How to draw a probability table

Answer 2

Let X be the random variable “score on the wheel”
x|1 2 3
P(X=x)

Question 3

What do all the probability’s add to?

Answer 3

1

Question 4

What does the E(X) mean?

Answer 4

The expected value, the mean from the distribution table

Question 5

What’s the formula for E(X)

Answer 5

Summation of ( xp )

Question 6

What is E(x^2)

Answer 6

Summation of ( x^2 p)

Question 7

What’s the equation of variance

Answer 7

E(X^2) - E(X)

Question 8

How to work out the standard deviation

Answer 8

The square root of the varience

Question 9

E(x+a) =

Answer 9

E(X) + a

Question 10

E(ax) =

Answer 10

aE(X)

Question 11

Var(any number) =

Answer 11

0

Question 12

VAR(x + a)

Answer 12

VAR(x)

Question 13

VAR(AX)

Answer 13

A^2 x Var(x)

Question 14

What does standard deviation mean

Answer 14

How spread the points re from the mean

Question 15

What does y =

Answer 15

N x p

Question 16

In the po distribution what does gamma equal

Answer 16

Mean/varience

Question 17

When on a calc what is
X
Lambda

Answer 17

probability
Mean

Answer 18

probability
Mean