How to get the fraction defective? What is its formula, by any chance, in order to derive/come up the answer/given that is shown in the photo.

For reference: https://www.scribd.com/document/373775375/Chapter-13B-Case

8. if the process could be improved so that the standard deviation were only about .10 millimeter, what would be the best that could be expected with the processes relative to fraction defective? if upper spec If upper and lower spec If centered 0 . 999993928 6 . 071 62E-06 0.000607162% -5.625 9.2754E-09 0.999999991 000060809091: {1999999713 2.86652E07 0.000057330% Based on the table above, if standard deviation were only about .10 millimeters, the best that could be done is for the process to be centered at 1.9 which fraction defective would only be about 000005733096 of the washers compared to 000060716296 and 0.000608090% which is if there is an upper specication, and if both upper and lower specication are considered, respectively