Mr. Zuro finds the mean height of all 17 students in his statistics class to be 66.0 inches. Just as Mr. Zuro finishes explaining how to get the mean, Danielle walks in late. D is 67.8 inches tall. What is the mean height of the 18 students in the class? . . . The mean height of the 18 students in the class is inches . (Type an integer or a decimal. Do not round.)