SOLUTION: The correct answer for this problem is not 21. I need help with this difficult homework equation. Can someone please show me how to come up with the CORRECT answer? Suppose the

Question 446319: The correct answer for this problem is not 21. I need help with this difficult homework equation. Can someone please show me how to come up with the CORRECT answer?
Suppose the life of a certain brand of vacuum cleaner is normally distributed with a mean life of 12 years and a standard deviation of 4 years. A vacuum cleaner is randomly chosen.
10. (3 points) For how many years should the manufacturer warranty its vacuum cleaners if it is willing to replace only 1% of the vacuum cleaners it sells (Round answer to the closest whole number).
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
this is a z-score problem ___ solve it using a table ___www.regentsprep.org/Regents/math/algtrig/.../ZChart.htm

the question is asking how many standard deviations below the mean represents the lowest 1% of the population
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