Question
A soft white 3-way bulb has an average life of 1200 hours with a standard deviation of 50
hours. Find the proportion of the life of one of these bulbs between 1150 and 1300 hours.
hours. Find the proportion of the life of one of these bulbs between 1150 and 1300 hours.
Answers
you can play around with Z-table stuff here:
http://davidmlane.com/hyperstat/z_table.html
http://davidmlane.com/hyperstat/z_table.html
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