The nonconformities of individual quality characteristics for a bicycle manufacturer is shown in the table below. Data were collected on the count of nonconformities for first and second week of April by inspecting 25 random samples.
a) Calculate central line and control limit for data collected.
b)Construct a control chart for count of nonconformities.
c)An analysis was conducted and it was found that bicycle serial number 276 was out of control but due to assignable causes. Establish the revised central line and control limits.