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What's the relationship between MTTR and "maintainability value of 95%"

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#1

What’s the relationship between MTTR and the metric in the example given in “For example, suppose a component has a defined maintainability value of 95% for half an hour. In that case, the probability of restoring the component to its fully active form in half an hour is 0.95.”

Course: Grokking Modern System Design for Software Engineers & Managers - Learn Interactively
Lesson: Maintainability - Grokking Modern System Design for Software Engineers & Managers

#2

Hello @lagos_tout
The MTTR(mean time to repair) in the example is 0.95. the system took 0.95 average amount of time to restore a failed component. MMTR in the example and explained further down, both are the same things. That is to measure the maintainability of the system.
I hope it will help.
Happy learning.