Yassos: these are nothing more than 800's at 5K race pace. The math (using the RW or Oregon Pace Wizzard) conversion factors works out easily.
As far as predictiors, I've found that in my first 2-3 years of running, the predictors failed when I got higher up in distance. That is, my predicted marathon times were much faster than what I was able to do. But, as I ran more and got stronger (but slower :-( ), my actual times more closely matched what was predicted.
Anyway, I'd advise a new runner to be very conservative with one's marathon goals. say, use "10K time times 5" as a rough goal, and plan to hit the 1/2 way mark a few minutes SLOWER than that pace. Remember that if the initial pace is to slow, you can always pick it up. But, if the initial pace is too fast, well, you are in a heap of trouble!
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