1. Reliability Analysis of a Ti-35II Calculator Rensselaer Polytechnic Institute Department of Engineering and Science DSES-6070 HV6 Statistical Methods for Reliability Engineering Term Project Curtis Heath Riewe August 11, 2008

2. Problem Description Analytically determine the reliability of a Texas Instruments Ti-35II calculator Determine mean time to failure (MTBF) Determine number of calculators that fail in the first month per million sold for warrantee issues Determine the which component that has the most impact on reliability

3. Methodology Tear down calculator to construct bill-of- materials Determine reliability of each component using Lambda Predict 2 –Specification MIL-217 Calculate the reliability of the system Rs using a series model Calculate the failure probability, Fs. Calculate the Birnbaums Numbers for the system

4. Results 99,520 hours Mean Time Between Failures 7330 Units can be expected to fail within the 30 day warrantee period per million sold. 84503 Units can be expected to fail within one year of purchase per million sold. The switch has the most significant affect on reliability of the calculator