Here is a data set:
7810714075606180
4920635093207930
6720789081907030
6880575084309320
8560656067604920
7670531078305100
6220556078909170


Construct a grouped frequency distribution table (GFDT) for this data set. You want 10 classes with a "nice" class width. Your classes should be labeled using interval notation. Each class contains its lower class limit, and the lower class limits should all be multiples of the class width. In that the data appears to be discrete, use a closed-interval to label each class.

Data rangeFrequency