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Baris ka-1: Sacara umum '''ekspektasi''' nyaeta tetempoan nu leuwih mungkin ngeunaan kajadian. Hasil nu kurang nguntungkeun ngakibatkeun naekna [[emotion]] '''kateupanujuan'''. Lamun sababaraha kajadian ngarupakeun hal nu teu sakabehna diperkirakeun disebutna [[surprise]]. Tempo oge [[anticipation]]. ---- Dina [[kamungkinan]] (hususna dina [[gambling]]), ~~the~~ '''~~expected~~nilai ~~value~~ekspektasi''' (oratawa '''~~expectation~~ekspektasi''') of a random variable is the sum of the probability of each possible outcome of the experiment multiplied by its payoff ("value"). Thus, it represents the average amount one "expects" to win per bet if bets with identical odds are repeated many times. Note that the value itself may not be expected in the general sense, it may be unlikely or even impossible. For example, an American [[Roulette]] wheel has 38 equally possible outcomes. A bet placed on a single number pays 35-to-1 (this means that he is paid 35 times his bet, while also his bet is returned, together he gets 36 times his bet). So the expected value of the profit resulting from a $1 bet on a single number is, considering all 38 possible outcomes: ( -1 × 37/38 ) + ( 35 × 1/38 ), which is about -0.0526. Therefore one expects, on average, to lose over 5 cents for every dollar bet.

Nilai ekspektasi: Béda antarrépisi