Comparison ofthe reliability oftwo products Two products, PI and P2, have exponential reliability laws of respective failure rates Al = 10-5, and A2 = 10-7, at a temperature of 18°C. We suppose that the failure rate is multiplied by 10 for an increase of temperature of 20°C for the product PI and of 10°C for P2. Furthermore, the products have a maximum temperature of good functioning of 100°C for P2 and of 120°C for PI .

For which temperature range does the PI product have a better reliability than the P2 product?