The toasters produced by a company have a normally distributed life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should be provided so that the company is replacing at most 3% of their toasters sold? Homework Help: 4VD. Calculating probabilities to compare to set probabilities such as warranties and production guidelines (2:23) 4.1 years 4.3 years 6.2 years 5.7 years