The Demand for Ballard's Glass Company's Products Varies, Ranging from 10

Multiple Choice

The demand for Ballard's Glass Company's products varies, ranging from 10 to 20 windows a day with an average of 15.John Ballard is the only worker and he works a maximum of eight hours a day, five days a week.Each order is one window, and each window takes 26 minutes to install.What is the average waiting time in minutes?

A) 1.6
B) 4.4
C) 28.2
D) 56.33
E) 82.3