Births in September

Question

The mathematical probability of a baby being born on a particular day in September is 1/30. In Travis County, 270 babies were born during the month of September

 

A) about how many births would you expect to have taken place on September 15th?

 

B) How might the number of births expected compare to the actual number of births on September 15th? Explain your answer

Answer 1

Regarding question A.   Assuming uniform distribution, given 270 births in September, which has 30 days, we would expect 9 births on any one day.

 

Regarding question B.   Given the information, there is no way to answer the question. In order to compare the expected number with the actual number, it is necessary to have the actual number.