The radiology department at a large hospital has an average retake rate of 8.8 percent; that is, 8.8 percent of its radiographs must be repeated because the picture is not sufficiently clear. Errors can occur because of incorrect patient measurement, improper calibration or setting of the machine, poor film quality, incorrect film processing, or other reasons. During the past month 9,000 radiographs were taken, and 11.2 percent had to be repeated. Does the process appear to be within its 30 limits, or does it appear that there may be some assignable cause for variation?