Answer
class width = 19.7
lower class limits = 54, 73.7, 93.4, 113.1, 132.8, 152.5, 172.2, 191.9, 211.6, 231.3, upper class limits = 73.7, 93.4, 113.1, 132.8, 152.5, 172.2, 191.9, 211.6, 231.3, 251
Work Step by Step
class width = (247-54)/10 = 19.7
Lower class limits = min + class width, repeat n times where n is # of classes
Upper class limits = max - class width, repeat n times where n is # of classes