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ISRO | ISRO CS 2020 | Question 4

  • Last Updated : 27 Nov, 2020
Geek Week

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: (B)

Explanation: Convert into the same unit then apply the formula.
Software availability,

= MTBF / (MTBF + MTTR)
= 20*24 / (20*24 + 20)
= 480 / 500
= 0.96
= 96 %

Option (D) is correct.

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