Jim Corner, owner of Corner Bike Rentals, wants to start analyzing his company's quality. For each bike rental, there are four types of customer complaints: $(1)$ bike not working properly, $(2)$ wrong bike size, $(3)$ bike uncomfortable, and $(4)$ bike broken during operation. During the past week, his company rented $280$ bikes. He received a total of twenty$-$six complaints If Jim wanted to operate at the five$-$sigma level, what would his errors have needed to be over the past week?