In statistics, what Greek symbol represents expectation, and what symbol represents variance?

In statistics, what Greek symbol represents expectation, and what symbol represents variance?





Thanks.

In statistics, what Greek symbol represents expectation, and what symbol represents variance?
Let X be a random variable





Expectation of X





E(X) = μ





Variance of X





Var(X) = V(X) = σ²





the sample stats are normally represented by xbar and s².
Reply:Expectation, or expected value, is usually given the Latin letter, E.


Variance is usually given the Greek letter sigma squared, σ².
Reply:Greek symbols for expectation and variance:





expectation - mu


variance - sigma^2
Reply:I represent variance by sxx /n-1, and it works wonders with examiners. As for expectation, although ive never heard of the term, I assume its 'the sum of' or .....wait a minute..... i dont have greek on my keyboard.....'Epsilon'