ISRO | ISRO CS 2020 | Question 4

What is the availability of the software with following reliability figures.

Mean Time Between Failures (MTBF) is 20 days
Mean Time To Repair (MTTR) is 20 hours 

(A) 90%
(B) 96%
(C) 24%
(D) 50%


Answer: (D)

Explanation: Software availability,

= MTBF / (MTBF + MTTR)
= 20 / (20+20)
= 20 / 40
= 1 / 2
= 0.5
= 50 %

Option (D) is correct.

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