Posted by **Anonymous** on Wednesday, October 7, 2009 at 2:46pm.

A certain type of thermal battery for an airplane navigation device backup power has a mean life of 300 hours with a standard deviation of 15 hours. Assume a normal distribution of backup power device lives. What proportion of these batteries can be expected to have lives of 322 hours or less?

## Answer this Question

## Related Questions

- MATH - Battery Power Problem. A certain type of thermal battery for an airplane ...
- 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 ...
- Math - A certain type of thermal battery for an airplane navigation device ...
- Help Math! - Battery Power Problem. A certain type of thermal battery for an ...
- Probablity - The life time of a certain kind of batteries has a mean life of ...
- 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 lifetime of a 2 volt non- rechargeable battery has a normal ...
- statistics - The lifetime of a 2 volt non-rechargeable battery has a normal ...

More Related Questions