A garment manufacturer produces 22 different coat styles, and every year new coat styles are introduced and old styles are discarded. Whatever the style, the final inspection department checks each coat before it leaves the factory for nine features that are considered critical-to-quality (CTQ) characteristics for customer satisfaction. The inspection report for last month indicated that a total of 366 deficiencies of the nine features were found among 8,240 coats produced. Determine
(a) Defects per million opportunities and
(b) Sigma level for the manufacturer's production performance.