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 ?
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Correct answer: D. 99.9924%
Explanation
Downtime = 20 × 2 = 40 minutes out of 365 × 24 × 60 = 525,600. Availability = 1 − 40/525,600 ≈ 99.9924%.
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