An electronics company manufactures several types of cathode ray tubes on a mass production basis. During the past month, tube Type A has caused considerable difficulty. The following table contains data from 21 days of this troublesome period. Compute the central line and 3 -sigma control limits for a p chart for this tube process. 100 units are inspected each day. Central Line =0.29;(UCL,LCL)=(0.30,0.12)