ITPEC IP October 2020 Question 15
ITPEC IP October 2020 — Question 15 of 100
The MTTR is 15 hours. The three repair intervals last 15 hours from 250 to 265, 20 hours from 580 to 600, and 10 hours from 990 to 1,000. Their total is 45 hours, and 45 ÷ 3 failures = 15 hours per repair.
Answer (b)
Why not others:
- 10 and 20 are individual repair durations, not their mean
- 45 is total repair time, not mean repair time
Key rule: MTTR is total time spent repairing divided by the number of repair events; normal operating intervals are excluded.
AI-generated — may contain errors
The original exam layout is preserved in the image so diagrams, formulas, tables, and code remain accurate.
This question comes from an official ITPEC past paper. ITPEC Practice is an independent study tool and is not affiliated with ITPEC. See the official IP past-paper collection or Report an issue.