There were 1,434 complaints from the 138,600 patients treated between Mar. 2011 and Dec. 2012. At what sigma level is the overall hospitality service at the hospital operating? (Hint: Assume each complaint as a defective and 1,434 unhappy patients. Calculate percent defectives. Get % non-defectives as process yield or meeting expectations. Now find Z-score corresponding to the process yield using Z-table as the sigma level).

**I calculated 98.965% as the percentage of defectives. but I need to figure out the Z-score for 0.98965 on a Z-table on a sigma level. ** Thank you