Motorola used the normal distribution to determine the probability of defects and the number of defects expected in a production process. assume a production process produces items with a mean weight of 7 ounces. the process standard deviation is 0.10, and the process control is set at plus or minus 1.5 standard deviation . units with weights less than 6.85 or greater than 7.15 ounces will be classified as defects. what is the probability of a defect (to 4 decimals)?