Yarn breaks on its own in the process of weaving denim cloth.  In
order to monitor this prociess, the quality control manager randomly
selects a spinning machine each hour and checks the number of breaks
during a 15-minute period.  Following is a summary of the observations
for a 20 hour period.

Sample        # of breaks      Sample         # of breaks

1                 3              11                3
2                 2              12                4
3                 4              13                6
4                 1              14                7
5                 5              15                8
6                 3              16                6
7                 2              17                5
8                 4              18                7
9                 0              19                8
10                2              20                6

Construct a c-chart using 3standard deviation limits for this process
and indicate if the process was out of control at any time?