Twenty windshield wiper motors are being tested using a


Twenty windshield wiper motors are being tested using a time-terminated test. The test is concluded when a total of 200 hours of continuous operation have been completed. During this test, the number of windshield wipers that fail before reaching the time limit of 200 hours is counted. If three wipers failed after 125, 152, and 189 hours, what is the failure rate and the mean time between failure (MTBF)?

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