:3. In a Public Health Service Study of 1964, a histogram was plotted showing the number of cigarettes per day smoked by each subject (male, current smokers), as shown in diagram ? on page ? of the test. The density is marked in parentheses. The class intervals include the right endpoint, not the left.
The percentage who smoked ten cigarettes or less per day is closest to
a. 1.5% b. 15% c. 30% d. 50% e. 70%