To complete the expression by narrowing the interval, you might want to express it in a form like:
\( a < 164 < b \)
where \( a \) and \( b \) are numbers that narrow the interval around 164.
For example:
- If you say \( 163.5 < 164 < 164.5 \), you have narrowed the interval around 164 to the nearest tenth.
Please provide specific bounds or ask for additional details if you need a different interval!