Current location - Training Enrollment Network - Mathematics courses - Mathematical probability problem! ! !
Mathematical probability problem! ! !
Using mathematical expectation, let x be the number of times to drink beer before selecting coins. The distribution list of x is:

Then the mathematical expectation of X is E(X)=5.5, that is, random selection requires an average of 5.5 bottles of wine.

So choose one bottle at a time if you want to drink more, and give up if you want to drink less!