1. A system has an MTBF of 1000 hours, and a mean time to repair of 10 hours. What is its average availability to the nearest whole percent? Do not include the percent sign in the answer, just the number.
2. A Duane model reliability growth test was conducted. The final cumulative MTBF shown by the line fit was 70 hours, and the growth rate was 0.3. What was the final instantaneous MTBF, to the nearest whole hour?