The American College of Obstetricians and Gynecologists reports that 32% of all births in the United States take place by Caesarian section each year. (National Vital Statistics Reports, Mar. 2010).
a. In a random sample of 1,000 births, how many, on average, will take place by Caesarian section?
b. What is the standard deviation of the number of Caesarian section births in a sample of 1,000 births?
c. Use your answers to parts a and b to form an interval that is likely to contain the number of Caesarian section births in a sample of 1,000 births.