Activity 9:



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Exercise 1: MTBF and MTT

  • A system has three components and requires all three to be operational for 24 hours from Monday to Friday. Failure of component 1 occurs as follows:
    • Monday = No failure
    • Tuesday = 5 am to 7 am
    • Wednesday = No failure
    • Thursday = 4 pm to 8 pm
    • Friday = 8 am to 11 am

 Calculate the MTBF and MTTR of component 1.

Exercise 2: Information Availability

  • A system has three components and requires all three to be operational from 8 am to 5 pm business hours, Monday to Friday. Failure of component 2 occurs as follows:
    • Monday = 8 am to 11 am
    • Tuesday = No failure
    • Wednesday = 4 pm to 7 pm
    • Thursday = 5 pm to 8 pm
    • Friday = 1 pm to 2 pm

 Calculate the availability of component 2.

Exercise solutions