Sunday

September 21, 2014

September 21, 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.

**Answer this Question**

**Related Questions**

Teacher Math - Battery Power Problem. A certain type of thermal battery for an ...

MATH Prob. - Battery Power Problem. A certain type of thermal battery for an ...

Help Math! - Battery Power Problem. A certain type of thermal battery for an ...

Math - A certain type of thermal battery for an airplane navigation device ...

Math - A certain type of thermal battery for an airplane navigation device ...

Statistics - The lifetime of a certain smart phone battery has an unknown ...

Statistics - The lifetime of a certain smart phone battery has an unknown ...

statistics - The life span of the battery pack is known to be Normally ...

math - The lifetime of a SuperTough AAA battery is normally distributed with ...

Math - The lifetime of a SuperTough AAA battery is normally distributed with ...