6-93. A manufacturer of coil springs is interested in imple- menting a quality control system to monitor his production process. As part of this quality system, it is decided to record the number of nonconforming coil springs in each production batch of size 50. During 40 days of production, 40 batches of data were collected as follows: Read data across. 9 12 8 5 9 7 7 8 11 4 4 8 7 11 14 11 3 6 4 17 6 4 6 5 13 7 7 8 13 7 19 19 6 18 9 12 5 17 12 15 (a) Construct a stem-and-leaf plot of the data. (b) Find the sample average and standard deviation.
