Question

Hello Rabbi Michael Abraham
In the book God Plays Dice, a probabilistic calculation is made regarding the development of life through the creation of mutations, and it seems that a piece of data is missing there (or perhaps I missed it) — the number of attempts is given (about 10^90), the number of possibilities as well (about 10^390), but regarding the number of “islands” — the stable results — I did not see a clear calculation, only an estimate that this is a “tiny” number. Did I miss the calculation? Is there somewhere else to find it?
 
Thank you in advance