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

Question:

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