This is clearly wrong .An EXPECTATION is NOT the same as a certainty. Some will disagree !

scepticus,

This is another example of a term being used in the "everyday" sense when in this context it refers to a technical sense. This results in pointless arguments because people are using different definitions of the same term.

Your definition of "expectation" is something like one of the following :

**expectation, outlook, prospect** -- (belief about (or mental picture of) the future)

**anticipation, expectation** -- (anticipating with confidence of fulfillment)

**expectation** -- (the feeling that something is about to happen)

But actually, in this context, it should be :

**arithmetic mean, first moment, expectation, expected value** -- (the sum of the values of a random variable divided by the number of values)