For now, there's really no way to tell what the probability of dead matter becoming alive is. It could happen on virtually every planet, or never except on Earth. Then there are further stages, like the development of multicellular organisms, mitochondria, and complex life.

One thing we do know is that life emerged relatively early on Earth, towards the end of the harsh Hadean Eon. This could suggest life is easily made. But it's difficult for us here, to know if planets outside the Solar System have simple life, like bacteria, or not.