Question

In a frequency distribution table with 12 classes, the class-width is 2.5 and the lowest class boundary is 8.1, then what is the upper class boundary of the highest class?

Answer 1

Upper class boundary = Lowest class boundary + width × number of classes
= 8.1 + 2.5×12
= 8.1 + 30
= 38.1
Thus, upper class boundary of the highest class is 38.1.