STAT 2300 Chapter 6.1

random variable

random variable

a variable that assumes numerical values associated with the outcomes of a probability experiment, where one (and only one) numerical value is assigned to each outcome

discrete random variable

has either a finite number of possible values or a countable number of values (many, number, fewer)

continuous random variable

has an infinite number of values that are not countable (any number on number line)

discrete

if you count to find a variable it is ____

continous

if you measure to find a variable it is___

probability distribution

discrete random variable X lists the possible values of the random variable and their corresponding probabilities. table graph or mathematical formula

mean / EV

x • p(x) = ( variable times ( times of occurrence) )

mean

Ux

standard variance

(x-u)^2 (p(x))

mean

μ