If you buy a terminal with an MTBF of 4000 hours,and you plan to use it for four hours a day for 20 days a month,then you would expect it to fail once every five months.

Question

Quizplus · Accepted Answer

To calculate the expected failure rate, we need to use the formula MTBF = (total operational hours) / (number of failures).

In this case, the total operational hours per month would be: 
4 hours/day x 20 days/month = 80 hours/month

So the expected failure rate would be: 
4000 hours / (80 hours/month) = 50 months

Therefore, we would expect the terminal to fail once every 50 months (or approximately every 4 years and 2 months), not once every five months.

If You Buy a Terminal with an MTBF of 4000