In the United States there is strong relationship between smoking and education with well-educated people less likely to smoke. A study in France included a sample of 459 men who were selected at random from men who had visited a health center for a routine checkup. Education is classified into three categories corresponding to the highest level of education and smoking status is classified into four categories.
The proportion of men with a primary school education that are nonsmokers is
a. 0.38.
b. 0.58.
c. 0.12.
d. 0.30.