Twenty samples of 100 items each were inspected when a process was considered to be operating satisfactorily. In the 20 samples, a total of 115 items were found to be defective.

(a) What is an estimate of the proportion defective when the process is in control?

__________

(b) What is the standard error of the proportion if samples of size 100 will be used for statistical process control? (Round your answer to four decimal places.)

__________

(c) Compute the upper and lower control limits for the control chart. (Round your answers to four decimal places.)

UCL = __________

LCL = __________