기대값은 말 그대로 당장 벌어질 결과를 뜻하는 것은 아니지만, 똑같은 결정을 거듭 내렸을 때 평균적으로 벌어질 결과를 뜻한다는 것이다.
The expected value doesn’t represent what we literally expect to happen, but rather what we might expect to happen on average were the same decision to be repeated again and again.