Asked by joseph onuorah on Jul 27, 2024
Verified
Century Digital Phone advertises phone battery life (on standby) of up to three days. The standard deviation is thought to be five hours. Tina Talbot, an employee at CDP, tested 10 of these batteries for 72 hours. One failed at 40 hours; one failed at 62 hours; one failed at 70 hours. All others completed the test. Calculate FR(%), FR(N), and MTBF.
Standard Deviation
A measure of the amount of variation or dispersion in a set of values.
MTBF
Mean Time Between Failures, a reliability metric that measures the average time between system failures in a process or product.
- Compute the Failure Rate (FR), Normalized Failure Rate (FR(N)), and the Average Time Between Failures (MTBF).
- Explain the significance of standard deviation in evaluating the dependability of a product, machinery, or procedure.
Verified Answer
PS
Pranav ShettyJul 30, 2024
Final Answer :
FR(%) = 3/10 or 30%. FR(N) = 3/[(72∗10) - 32 - 10 - 2] = 3/676 = .00444. MTBF is 1/FR(N) = 225.3 hours.
Learning Objectives
- Compute the Failure Rate (FR), Normalized Failure Rate (FR(N)), and the Average Time Between Failures (MTBF).
- Explain the significance of standard deviation in evaluating the dependability of a product, machinery, or procedure.