Averaging Principle Average height of the students in class is / →There is a student of height≥l(sl) max avg min For a random variable X, ·3x≤EX☑，such that X=x is possible; ●3x≥EX],such that X=x is possible• Average height of the students in class is l. ⇒ There is a student of height ≥ l ( ≤ l ) Averaging Principle min max avg • For a random variable X, • ∃ x ≤ E[X], such that X = x is possible; • ∃ x ≥ E[X], such that X = x is possible