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