Assertion: distribution's mean | /r/HasProperty | undefined
Facets:
Source sentences:
text: This means that the expected value does not exist, and that the mean is undefined.
text: The harmonic mean (H X ) of a Beta distribution with α < 1 is undefined, because its defining expression is not bounded in  for shape parameter α less than unity.
text: The harmonic mean (H (1 − X) ) of a Beta distribution with β < 1 is undefined, because its defining expression is not bounded in  for shape parameter β less than unity.