The birth rates of all countries in the world (births per 1000 people) has a mean of 27.65 births (per 1000 adults) with a standard deviation of 2.35. Answer the following questions. Hint: At least 1 - 12 a) What percentage of countries must have a birth rate between 11.2 and 44.1 births (per 1000 adults)? Round answer to two decimal places. At least % of countries have a birth rate between 11.2 and 44.1. b) What percentage of countries must have a birth rate between 18.25 and 37.05 births (per 1000 adults)? Round answer to two decimal places. At least % of countries have a birth rate between 18.25 and 37.05. Show All