question_answer

A group of investigators took a fair sample of 1972 children from the general population and found that there are 1000 boys and 972 girls. If the investigators claims that their research is so accurate that the gender of a new born child can be predicted based on the ratio of the sample of the population, then what is the expectation in terms of the probability that a new child born will be a girl?

A)  \[\frac{243}{250}\]                  

B)  \[\frac{250}{257}\]

C)  \[\frac{9}{10}\]            

D)  \[\frac{243}{493}\]