Assertion: distribution's variance | /r/CapableOf | count the number of successes
Facets:
value: before the r-th failure
type: TEMPORAL
value: given the number r of failures
type: OTHER
Source sentences:
text: When counting the number of successes given the number r of failures, the variance is rp/(1 − p)2.
text: When counting the number of successes before the r-th failure, the variance is r(1 − p)/p2.