im Corner, owner of Corner Bike Rentals, wants to start analyzing his company's quality. For each bike rental, there are four types of customer complains: (a) bike not working properly, (b) bike wrong size, (c) bike uncomfortable, and (d) bike broken during operation. During the past week, his company rented 280 bikes. He received 26 total complaints.

a. What is his company's DPMO for the past week?

b. What is their Six Sigma operating level?

c. If Jim wanted to operate at the 5 sigma level, what would his errors have needed to be over the past week?