A grouped frequency distribution table with classes of equal
sizes 63 - 72 as one of the class is constructed for the following
date: 30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 78, 88, 40, 14, 20,
15, 35, 44, 66, 75, 84, 95, 96, 102, 110, 88, 74, 112, 14, 34, 44.
The number of classes in the distribution will be
a. 12
b. 11
c. 10
d. 9