Assuming that the probability of finding a particular zodiac sign is 1/12, the probability of randomly seeing 27 or more of 250 people being libra is still 10%.

Assuming that the probability of finding a particular zodiac sign is 1/12, the probability of randomly seeing 27 or more of 250 people being libra is still 10%. So: no, this does not mean anything. (This does not take into account that the fraction of zodiac signs of a year might not exactly be 1/12 and does not deal with variations in numbers of births over the month of a year but from what I have seen, October seems to be seeing more births than other month (might be because of it having 31 days?). Libra starts at end of September already though, so ... whatever)