Response Time and Availability Exercises

1. In teams of two, answer the following questions (and show your math):
   • What is the availability of a system that fails every 48 hours and takes:
     1. 10 minutes to recover?
     2. 2 hours to recover?
   • What is the availability of a system that fails 10 times every 100 hours, when:
     1. recoveries take 5 minutes?
     2. 90% of the recoveries take 5 minutes and 10% take 2 hours?
     3. 90% of the recoveries take 5 minutes and 10% take 15 minutes?