OE

The total number of students in the class can be calculated by adding up the heights of all the bars: 6 + 3 + 1 + 5 + 4 + 2 = 21. Each bar represents a number of flights equal to the product of the number of flights and the number of students. Thus the total number of flights is 2 × 6 + 4 × 3 + 5 × 1 + 6 × 5 + 8 × 4 + 10 × 2 = 111. The mean is found by dividing 111 by 21, which is approximately 5.3.