Meaning of mathematical expectation

mathemat'ical expecta'tion

Pronunciation: [key]
  1. the product of the probability of the occurrence of an event and the value associated with the occurrence of a given event.
  2. the summation or integration, over all values of a variate, of the product of the variate and its probability or its probability density.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.