A class has 20 students whose heights are as follows: There are 4 students with a height of 5.5 feet, there are 5 students with a height of 5.8 feet, there are 3 students with a height of 6.0 feet, there are 5 students with a height of 6.2 feet, and there are 3 students with a height of 6.5 feet. If a student is randomly selected from the class, what is his expected height?