Posted by Maria on .
If the life in years, of a television set is normally distributed with a mean of 46 years and a standard deviation of 4 years, what should be the guarantee period if the company wants less than 3% of the television sets to fail while under warranty?

Finite Math 
drwls,
That would be about two sigma less than the mean, but did you really mean 46 years mean life? No one keeps a TV set that long, nor is there accurate lifetime data available.

Finite Math 
Maria,
I know but that's what the question asked.
Thanks 
Finite Math 
drwls,
In that case, 97% will last longer than 38 years.