Asked by Haris

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.

Answers

Answered by oobleck
you can play around with Z-table stuff here:

http://davidmlane.com/hyperstat/z_table.html
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