Allan Hinge Company records 8 primary quality opportunities during production of a particular type of brass door hinge (these are opportunities for a defect, mistake, or error). After an inspection of 370 random hinges, a worker finds a total of 22 nonconforming parts. a) On average, how many defects per unit? b) On average, how many defects per opportunity? c) On average, how many defects per million opportunities? d) What is the sigma capability?