Question

Need help with word problem.
In the life, inyears of a television set with a mean of 20 years and a standard deviation of 1.8 years, what should be the guarantee period if the sompany wants less than 1% of the tv sets to fail while under warranty?
should I take the .1 - 20/1.8=
no, you will need a table of values for the normal distribution or a webpage normal distribution calculator.
I find this one very good
http://davidmlane.com/hyperstat/z_table.html

in the second graph, enter
20 for mean, 1.8 for SD, and .99 as the shaded area.
click on "below" it should show 24.1874

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