Posted by **harish** on Wednesday, February 13, 2013 at 7:22am.

The lifetime in hours of a certain make of batteries follows a normal distribution with mean 160 and standard deviation 30.

Calculate the interval, symmetrical about the mean within which 75% of the battery lifetimes lie.

## Answer This Question

## Related Questions

- 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 ...
- statistics - The lifetime of a 2- volt non- rechargeable battery in constant use...
- 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 in constant use ...
- statistics - The lifetime of a 2-volt non-rechargeable battery in constant use ...
- Statistics - The lifetime of a 2-volt non-rechargeable battery in contant use ...
- Statistics - The lifetime of a 2-volt non-rechargeable battery in contant use ...
- statistics - A company produces batteries whose lifetimes are normally ...

More Related Questions