Question

Assume a device manufacturer tests 100 devices. The first device fails at 100 hours. The last device fails at 200 hours. What is the device MTBF:a. 10,000 Hoursb. 15,000 hours c. 20,000 hours d. 100 hours

Answer 1

a. 10,000 Hours

Explanation:

MTBF (Mean Time Between Failures) can be calculated using the formula:

`MTBF={(L-F)}*{n}` where

• L is the time at which last device fails (200 hours)

• F is the time at which first device fails (100 hours)

• n is the number of devices tested (100)

`{MTBF=(200-100)}*{100}=10000`