plz use R or excel to solve this question. thanks

Problem # 7 A production line assembles electric clocks. The average number of nonconformities per clock is estimated to be 0.80. The quality engineer wishes to establish a c chart for this operation, using an inspection unit of ten clocks. (a) Find the three-sigma limits for this c- chart. (b) Find 0.995 and 0.005 probability limits (using poisson Distribution table) for cchart