Correct, I used rounding. I can reveal that the unrounded number is the closest inverted power of 2, to 0.1.That number bothers me. The normal proportion of parentage goes in divisions of 2, 4, 8, 16 and so on, since generations normally involve two parent multiples. To be 1/10th of something implies that ... hmmm. A grandparent who was 0.8 Jew? Or two great-grandparents who were, collectively, 1.6 Jews? Or 3.2 Jewish great-great grandparents?
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