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OpenStudy (anonymous):
The life expectancy of a typical lightbulb is normally distributed with a mean of 4,000 hours and a standard deviation of 42 hours. What is the probability that a lightbulb will last between 3,875 and 4,055 hours? answer options A. 0.8835 B. 0.7825 C. 0.9133 D. 0.9035
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OpenStudy (anonymous):
@ganeshie8
ganeshie8 (ganeshie8):
knw how to use ztables ?
OpenStudy (anonymous):
no
ganeshie8 (ganeshie8):
do u have a ztable with you ?
OpenStudy (anonymous):
no i dont
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OpenStudy (anonymous):
the answer cannot be in decimal it should be in whole number
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