Enter your data for C Chart

Stat > Control Charts > Attributes Charts > C

In Variables, enter the column that contains the process data. Each row contains the number of defects for one subgroup.

In this worksheet, the Irregularities column contains the number of defects, such as tears and pulls, that were found in each subgroup. For example, row 1 indicates that 10 irregularities were found in subgroup 1.
C1
Irregularities
10
8
7
9