- A machine has three types of components named C1, C2, C3. The following table shows the quantity and failure rate of each component. Conceptual design enforces machine to have mean corrective maintenance time of 45 minutes. Predict mean corrective maintenance times for the components. Prove that your prediction is compatible with machine's mean corrective maintenance time. Component Quantity Failure rate (per hour) C1 C2 C3 231 0.3 1.5 0.4