UGC NET Computer Science July 2018 – II Question 14

Question 14

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14. A software system crashed 20 times in the year 2017 and for each crash, it took 2 minutes to restart. Approximately, what was the software availability in that year ?

Options:

1. (1) 96.9924%
2. (2) 97.9924%
3. (3) 98.9924%
4. (4) 99.9924%

Answer : (4) 99.9924%

Explanation Question 14

Given:
Year 2017 Time period = 365 days
No of times crashed in the year 2017 = 20 times
Time to restart = 2 minutes

Solution:
Software availability is ratio of the total time for which a program is available/operating to the Total time. 
Given time period 365 days => Total time of 365 days in minutes = 365 x (each day has 1440 minutes) = 525600 minutes

Software unavailability time = (crashed 20 times in the year 2017) x (each time it took 2 min to restart) = 20 x 2 = 40 minutes

Software availability in year 2017
= 525560 / 525600
= .999924 or 99.9924 %

So, Option (4) is correct answer.

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