The probability to have one female Miqo'te of a tribe:

5,6761*10^35 combinations

[100 * 100 * 192 * 8 * 100 * 27 * (sqr(192)) * 4 * 4 * 6 * 2 * (sqr(192)) * 5 * 6 * 4 * (1 + 96 * 2) * 32 * 4 * 192 * (27 + 13) * (96 * 2) * 12]

1 / 5,6761*10^35 chance


If we take into account that height, bust size and tail length are hardly distinct-able for each 1-step and take 25-steps instead, reducing the amount of possibilities from 100 to 5 (0, 25, 50, 75 and 100).
Similarly you could argue that skin tones follow suit, reducing the amount of possibilities (192) by 4(?). (192 / 4)

We end up with
1,7738*10^31 combinations

[5 * 5 * (192 / 4) * 8 * 5 * 27 * (sqr(192)) * 4 * 4 * 6 * 2 * (sqr(192)) * 5 * 6 * 4 * (1 + 96 * 2) * 32 * 4 * 192 * (27 + 13) * (96 * 2) * 12]

1 / 1,7738*10^31 chance

Assuming my math is not off. :b