WIll fan and medal!
The Boffo Product Company sells a waffle iron on which they have done product testing. They have determined that the amount of time the product will last can be described by a normal distribution. In particular, the average waffle iron lasts for 12 years and one standard deviation is 8 months.

How long should they warranty the product for if they want no more than 6.7% of the waffle irons to fail within that time?

Question

WIll fan and medal! 
The Boffo Product Company sells a waffle iron on which they have done product testing. They have determined that the amount of time the product will last can be described by a normal distribution. In particular, the average waffle iron lasts for 12 years and one standard deviation is 8 months.

    How long should they warranty the product for if they want no more than 6.7% of the waffle irons to fail within that time?

anonymous · Answer

Exact problem and how to do it : https://answers.yahoo.com/question/index?qid=20140613075018AAf2311