expected utility

World English Dictionary
expected utility
 
n
statistics the weighted average utility of the possible outcomes of a probabilistic situation; the sum or integral of the product of the probability distribution and the utility function

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Expected utility is always a great word to know.
So is interrobang. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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