Final answer:
The probability of at least one birth being a girl among the next eight randomly selected births is 0.991.
Step-by-step explanation:
To find the probability of at least one birth being a girl among the next eight randomly selected births, we will calculate the probability of all births being boys and subtract it from 1.
The probability of a single birth being a boy is 0.531. Therefore, the probability of all eight births being boys is (0.531)^8 = 0.009.
Subtracting this probability from 1, we get the probability of at least one birth being a girl as 1 - 0.009 = 0.991.