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December 22, 2014

December 22, 2014

Posted by **Ty** on Thursday, April 1, 2010 at 11:01am.

for an airplane navigation device backup power has a

mean life of 300 hours with a standard deviation of 15

hours. What proportion of these batteries can be

expected to have lives of 322 hours or less? Assume a normal

distribution of backup power device lives.

- MATH -
**PsyDAG**, Friday, April 2, 2010 at 11:08amZ = (x - mean)/SD = (322-300)/15

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion below the Z score found from above.

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