Odds of intelligent life occuring?

[Jehanne]

Absence of evidence is not evidence of absence.  Besides, there is some evidence of ET:

https://en.wikipedia.org/wiki/Wow!_signal

It hasn't been replicated, but if it was just a beacon, that would be perfectly understandable.  And, we haven't been looking continuously for it since it was first detected.

There's no reason to believe the "WOW" signal came from another intelligence somewhere out there.

Did you read the article?

Ehman has said: "We should have seen it again when we looked for it 50 times. Something suggests it was an Earth-sourced signal that simply got reflected off a piece of space debris."[14] He later recanted his skepticism somewhat, after further research showed an Earth-borne signal to be very unlikely, given the requirements of a space-borne reflector being bound to certain unrealistic requirements to sufficiently explain the signal.[7] Also, it is problematic to propose that the 1420 MHz signal originated from Earth since this is within a protected spectrum: a bandwidth reserved for astronomical purposes in which terrestrial transmitters are forbidden to transmit.[15][16] In a 1997 paper, Ehman resists "drawing vast conclusions from half-vast data"—acknowledging the possibility that the source may have been military or otherwise a product of Earth-bound humans.[17]

https://en.wikipedia.org/wiki/Wow!_signa...27s_origin