Definition/Meaning  Word/Phrase 
random and not inherent 
adventitious

accidental or random 
aleatory
,
contingent
,
haphazard

sum of the values of a random variable divided by the number of values 
arithmetic mean
,
expectation
,
expected value
,
first moment

mating of individuals having more traits in common than likely in random mating 
assortative mating

game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards 
beano
,
bingo
,
keno
,
lotto

(statistics) law stating that a large number of items taken at random from a population will (on the average) have the population statistics 
Bernoulli's law
,
law of large numbers

fortunetelling by random Bible verse 
bibliomancy

random motion of small particles suspended in a gas or liquid 
Brownian motion
,
Brownian movement
,
pedesis

reading superficially or at random 
browse
,
browsing

inquiry into public opinion conducted by interviewing a random sample of people 
canvass
,
opinion poll
,
poll
,
public opinion poll

random and whim, according to 
capricious
,
fickle
,
impulsive

random event 
chance

variable quantity that is random 
chance variable
,
random variable
,
stochastic variable
,
variant
,
variate

statistics, simultaneous change in value of two random variables in 
correlation

aimless and random 
desultory

casual and random 
desultory

small cubes with 1 to 6 spots on the faces; used to generate random numbers 
dice
,
die

(physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation 
diffusion

mating of individuals having traits more dissimilar than likely in random mating 
disassortative mating

random or left to one's own judgment 
discretionary
