A bathtub manufacturer closely inspects several tubs on every shift for nonconformances such as leaks, lack of

Question:

A bathtub manufacturer closely inspects several tubs on every shift for nonconformances such as leaks, lack of symmetry, unstable base, and drain malfunctions. The following list gives the number of nonconformances per tub for 40 tubs. Use these data to construct a c chart of nonconformances for bathtubs. Comment on the results of this chart.